If you intended for "all the starting events that "skew" towards attraction to women" to be skippable, the game is bugged, because most of them absolutely are not skippable in any way. Meeting all the teachers, who are all female, is required and the MC is attracted to every single one of them without any player choice.
Furthermore, loving your mother in a familial way and wanting to do the tutorial to learn how the game works do not in any way imply that my character is attracted to women, except the game absolutely assumes I am if I make those choices. In fact, it assumes I'm attracted to Hinata before I make a single choice in regard to her.
Either you are still very, very, very confused about what sexuality is, or you have not playtested your own game. Given the fact that you keep going on about dating as if that has the slightest relevance to sexuality -- which it does not -- I assume it's the former.
It's possible that a heterosexual person playing this game wouldn't notice how completely in your face the MC's obvious heterosexuality is, but as a gay man myself attempting to play it, it could not possibly be more obvious without stating it explicitly.