How can I improve my livelihood?

I'm not a very happy camper right now. I'm a freshman in high school and my parents constantly stress me out about my grades. I have two high C's and the rest of my grades are B's and my parents, specifically my mom who was a very good student, keep telling me colleges won't even look at me and that I might as well go to a community college when I graduate high school. I have friends however I haven't hung out with them in awhile even though I talk to them a lot at school and during volleyball practice. I've also been on two school sport teams this year basketball and volleyball. I almost never played on basketball and I often questioned how good I was even though I also am on an AAU team. I don't know if I'll make the sophomore team for my school next year. I haven't gone to one of my AAU practices in awhile and sometimes I wonder if I'll play in any tournaments this spring. My first year playing volleyball is going well, I play a lot and think my future is very bright for the sport. However, because of all the bad things going on with me right now I find myself being depressed and angry a lot of the time. Is there any help for me?