I need life advice

I’m 20 years old and living with my dad. my parents got divorced when I was 17 and I dropped put of high school to help with his business because he convinced me it was the right thing to do. now I’m 20 no high school education (I got a ged) and working at for my dad 5 sometimes 6 days a week remolding and cleaning swimming pool. I have no friends and never had a girlfriend or anything like that but I wanna become I personal trainer I just can’t pay for the classes. any time I ask my dad for money or time off he wines and complains ab his problems. I wanna start living my life but I have no idea what to. help? also sorry for the bad grammar