So this is really vague as i read it years ago. I remembered reading a story about a guy, who was approached by a woman from his past about time travelling. He goes back in time, in his teens. I recall him and his sister was living with their relative's and their aunt is a bitch. He interacted with the girls in a sorority even nearly sleeping with the leader but didn't. He even tutor someone there and they became a thing, but the girl cheated with another college guy. He became slighly popular for hanging out with college women. At the end of it, when he was going to college he told his sister about his time travelling. His goal was to find the girl from his past in college.
Pretty vague i know, but it's the only thing i remembered that's why i'm looking for it to reread. Can't seem to find it though.