anyone know this story? Need help finding

[stmvstmv]

I'm looking for a story about a guy who gets sent back in time , he goes to school beats up a bully who later tries to kill him, he saves his sister from getting in her boyfriends car which goes over a bridge and she dies the first time, then makes of money from the stock market, saves his parents marriage. He keeps his mouth shut about his affairs and gets to have a lot of girls including his mothers friend with whom he has an affair and later sets her with another guy. I think that's how i remember the story, let me know if anyone know the author or the story. Thanks.