It's working now, thanks for the advice.
I used the "reso" method, for those with this problem that are reading, I used 640x480 resolution, the game now doesn't lag and I can see everything now.
I remember pressing a bunch of buttons in the first rabbit dialogue in the hub because the game freezed for 5 seconds, maybe it's that freeze while button mashing that the 16:9 fullscreen problem exists.
Also, when I started reso for the first time Windows warned me that it was from a unknown author and it could be virus, you guys decide if you want to fix your game or not.