Emotional blubbler

I've been trying to push away this doubt I've been feeling ever since I handed in the last paper I had sat for during my final examinations. I knew I hadn't done the best I could for that final paper, but what more could I have done then? It was over. All I could do was to think about it. Think. Think think think. Over think. I had officially screwed up. I could pretty much witness my dreams of furthering my studies for a year in the University of Warwick next year; similarly to witnessing my Macroeconomics paper decide the fate of my future as I handed it in to the examiner. Though my friends were mostly (if not all) elated that the stress of finals had finally ended, I somehow couldn't share any mutual feelings. 

Over thinking had definitely been horrible and dangerous to maintaining my balance of mental sanity. I know I've never been good enough for my parents, academically. Never have I placed top 5 in class (come to think of it, don't think I ever cut top 10), never managed to score straight As in any examination, never received awards for my academic results, never earned myself a scholarship.. Feels pathetic to bring more disappointment to them, especially at this point in my life. Sure I've achieved things in life, but how much has it given back to me? I've gotten medals for running, but I'm no athlete. I've become the editor for school/college magazine, but I'm not a graphic designer. All these little 'extras' never helped me to get a scholarship to lighten the burden off my parents' shoulders, nothing. I've been trying to prove to not only them but also myself that I'm not worthless. I don't want to be one of those people whom someone has put so much effort, time, money and faith into but yet turn out to be a disappointment. Who does?

Hell, it's barely even helping to have peers who are extremely brilliant in everything they do in life, yet when you try your hardest to be someone like them, your efforts fail you. What am I doing wrong?