Does doing really good in high school pay off..?.?????!?

I'll try to make this as short as possible I am 15 almost..and I'm a girl...I want to be successful in life and have alot of money like alot. But lately I've been feeling depressed becasuse I have no friends and no one is interested in me they just keep walking or they are just acquaintances :( I try so hard I tried out cheerleading and didn't make the team my dad said I' need to find out what I like because it can't be cheering if I don't hangout or talk to those kind of girls this made me feel bad but it's true because they are really snotty and I'm actually a really nice sensitive person not to be conceited ....and he said if I do good in high school and college I'll get paid alot of money then I'll eventually have friends with lots of money and I'll be happy unlike now but I feel like I'm letting my childhood drift away because I don't know how to make friends and I'm not confident I don't even know what I like and don't have a certain style...I used to be really girly but now I'm so depressed I just wear sweats and jeans...is it true that it all pays off? I don't want to regret throwing my childhood away I don't even have pics of myself on facebook because i have no friends......please help