The main problem here is that, the main FMC is very unstable(at least based off of 2 chapers). Ppl can in fact change, but the main issue at hand is that, it is severely unrealistic to think it will happen from one day to the other. Habits are called habits for a reason, they don't just "die down" very fast. IMO, if I knew the girl slept with all guys, and suddenly tried to change, I will ofc not even try to get involved with her romantically in any way, ESPECIALLY when hearing her reason. "I slept with guys cuz it made me popular" is not really a hook to try to get me to date you. HOWEVER, helping you is a different matter. If she genuinely wanted to change for the better, I wouldn't mind helping or try to be her real "first friend". Only then, in a realistic setting, time will tell if I want to really get a relationship with. Cuz, let's be real, in today's society, it will be very hard to find a partner that has never had sexual relations, especially women(and yes, this is even in high school). Ofc, it varies from culture to culture, but in the U.S., it'd be next to impossible to really find a partner without experiencing sexual relations. Anyways, I digress.
Me personally, will probably keep a watch on this, since I sorta like the MC. I've read a lot of series where the FMC starts off very horrible and gives off a terrible bad impression, but with time, it might change. I really like series with characters having true redemption arcs lol