When it comes to stats, the main thing I can think off is that the very first choice has some options that raises your stats more, but are supposed to decrease other stats to balance it out. But since stats starts at 0, a stat penalty has no effect - thus picking the options with the highest bonus/penalties is better than the more “balanced” options. In fact, the stat penalty actually raises the stat from 0 to 1%! So for instance, picking “football player” as your background is mathematically the best option, since it raises all of your stats (though two of them by only 1%)
When it comes to grammar, aside from the occasional typos, I noticed that if you flirt with Jane, after the “smile” option, the narrations calls her a he - for that matter, there’s a couple of times where a female MC is also given masculine designation.
Anyway, this seems to be a pretty fun project! I’ll try to think of possible backgrounds that could mesh well with what you’re going for. As for more fighters or clubs, it’s a bit soon to offer suggestions, but one thing I think could help the story is having one character who would serve as a rival/foil to the MC, possibly with a personal connection to heighten dramatic tensions. Ideally that means several encounters.