If i remember correctly the MC dies while attending a poker tournament. He awakens as a teen again at home where:
1. he starts up a conversation with prettiest girl in school on the bus who he eventually marries at the end
2. his father is an abusive husband, the mother eventually leaves and marries a rich guy towards the end of the story. the guy is a booster at the school he eventually plays college football at.
3. the MC changes his lifestyle, becomes healthy and a football star in HS and college
4. He of course, has sex with tons of girls in HS and college, using his maturity.
Cannot recall the title or character names -- broad searches are coming up with zip.