Don't know what to do

I'm an 18 year old college student, in a pretty prestigious school, and I've been feeling a few symptoms of depression for a few years now. I also feel like I can never give enough for what people expect out of me. I just hate having the feeling that I need to prove myself, but yet don't really know how. I can't figure out what to do to make things better.

I recently got my grades from school, and didn't do so well in my core classes. I only just broke the news to my parents, and they weren't too happy about it. I know I need to do well but all the pressure on me just fries me out. I don't know what to do anymore