Sorry to hear that mate BUT, just one thing: 

what you didn't like is the result of your own actions, why did you steal Alice, why did you kicked Josef out the house. Anna, while not a good person per se, also behaves like that because of her insecurities (you would also see how her relationship was actually going to shit because both her and Josef didn't communicate, is just when you share with him that that comes a float). If you would have chosen to share her with both Adrian and Josef, you would see how they actually have a good time and there's none of what has given you issues (they all live happy, even one of the current endings is Adrian and Mc moving out and coming to visit and have "fun").

While each person can have their own opinions, this is by no means a 3/10, and what you experienced is because of your own decisions, otherwise you would know that Chloe is not a "piece of shit" is just a Starmaker girl, and even less is Tristan, whom if you help, you would have seen how he becomes a damn good friend to mc, even saving him from Frank (the insurance guy).

Dude, talk about seeking solace in the wrong places. All porn games are power fantasies, they are an escape from reality. Starmaker just has extra steps where you can find your way to your success. Take it as a lesson to build upon yourself, find confidence and get yourself back out there!!

I sympathize with you, but I think you just found the game at the wrong time for you. NTR isn't for everybody, and even within NTR there are many subgenres which may be mutually exclusive for people.

Starmaker Story would generally be considered "Netori" (where you "steal" another person's partner). However, I choose to think of the story from a more wholesome perspective.

Even before the player and Anna start their Starmaker page, Anna isn't happy. She used to be full of life, living a hedonistic, party-filled lifestyle. Then, when she married Joseph... All of that was gone. While Anna gravitated to some parts of her new life, there was a large part of herself she felt she had lost. The player helps her feel wanted again when Joseph doesn't.

The player, Anna, Joseph, and Adrian are all flawed characters, with their own weaknesses and vices to overcome. You, as the player, can help them overcome those vices, or cause them to lean into those vices. It seems like the choices you made caused those characters to lean into those vices.

I am sorry the game had this effect on you; it has icked me out a few times as well. You asked if this is a common experience with the game and I would guess not. The title of the game is "Starmaker Story" and the inciting incident is you agreeing to help Anna make a Starmaker Page behind Joseph's back. I feel that lays out pretty well what kind of game this is (Netori). Most people who would be affected by Netori would probably stop playing.

I'll admit, Starmaker doesn't always get my flavor of NTR right. I want Anna to be sexually liberated and kinky, but only with me. However, many other people play the game and want to corrupt Anna further, sharing her with many other partners. Trying to appease both kinds of players if a difficult balancing act, and sometimes Starmaker is unable to maintain that balance. Sometimes the labels on choices aren't quite clear enough and you see something you didn't expect. I am able to stomach both flavors, but if you can't, it can be distressing. 

I am getting the feeling that you were fine with some light Netori, but perhaps not as far as the game goes. Perhaps you were fine with corrupting Anna into leaving Joseph, but perhaps were not okay with her constantly badmouthing him and disrespecting him, or having sex with the player while she is still in a committed relationship with Joseph. If that is the case, I'm sorry things went further than you were comfortable with.

That was a lengthy post, so I will try to summarize. TLDR: 1: All the main characters have their flaws and can work towards correcting them based on player choices. 2: You experience is (anecdotally) not that common, but I sympathize. 3: Starmaker isn't perfect and, like all media, you may find something you didn't expect. Starmaker generally does a good job labeling important choices, but mistakes happen and you might see something you didn't want to see.

I hope things get better for you. Maybe you can return to Starmaker at a better time in the future, but it might not be the game for you right now.

While I'm with you that I don't like NTR, it can't technically be considered that since it's sharing, not cheating and it's completely avoidable, if you saw some scenes then it's due to your decisions, and yes, some can be quite misdirected but it'll be pretty obvious most of the time, and well, the slut and pure routes only changes her behaviour and dialogues in certain events, in whether she's more open sexually and more comfortable being nude publicly and yes, whether she's able to be with someone else if you decide it like that.

For Adrian, sadly the "only" girl that he likes is Alice so you have 3 options, steal, share or leave her to him, and I know, it's a complicated choice since seeing her with someone else might be a bit weird if you're not into sharing and stealing her might make you feel bad for Adrian, I choose to steal her since I can always share Sam with him as well. For the dialogues saying that he's not as big as you, the difference is not that big and it seems to be the average in that city/universe, the MC only got a bigger one, the girls also have unrealistic breasts, waist, ass size that not every woman you meet has so take it as it is, only fantasy.

The Joseph and Anna point, while yes, it feels sad that Joseph felt like he let the entire family down and that his wife is cheating on him, he also can cheat on her if you tell her about his ex wife and you so it's not like he's that innocent either, he's a good man trying to provide for his family but good intentions aren't always enough, if this was another game then it could've been different, but the premise is that you help your "milf", his wife, to do a porn page to help with the debt, so if you read what the game was about then you knew what was comming. It's kinda the same situation as Alice's, steal Anna or share her, or you can just ignore him and pretend he's not there since he' almost always in his office and you might not see him, just in special events and Fridays.

Buddy, I'm sorry you're going through some rough times and that this game hit you different with some things, I've been there with other games, just remember, this is only fiction and fantasy, size doesn't mean everything in real life, someone skilled with hands, tongue and knows what he's doing is way better than someone with just a big dick, and if someone tells you otherwise they're just lying, exaggerating or have the mindset of a 13yo. I'm sorry about your gf, as some have said before, you found this game at a wrong time, take a break from these games and content, focus on yourself, try to be a better version of yourself (for you, not others) so that you can be at peace with who you are since you might be creating an unrealistic expectation for you, go to therapy, gym, find some new hobbies, focus on what you can change and try to accept what you can't, I'm not saying do a 180° change and stop doing what you like, just try new things, a fresh perspective is always good when you've been in the same spot for so long. 

I wish you the best, don't listen to the people that is saying "it's just a game", even the tiniest thing can trigger something big at the wrong time, place and mind.