I am alone, i have no one, why?

I try so hard to make things work. I study i am great student at university, i take dance classes,i really am a good person, i am friendly, kind and i want to make change in this world. However i am not happy, i am alone (except my parents who only care about my grades) and even though i have a few friends many times i feel like people are avoiding me, i am like one of those people who love physics, chemistry, philosophy, someone who loves documentaries and reading books...and i love talking with friends about these subjects but people don't understand me, most of them tell me that i need to have fun and enjoy while i am young. And then they don't like going out with me because i don't know anything about fashion and i'm not interested in the things they do. And i love to enter my dance competition but i don't have a partner and even though i know how to dance i can't.....and that really makes me sad because with time i have to quit and be all alone with my books in the laboratory in my university....well i am so sad....i feel like i am useless and i am going to do my best to make a change in this world even though i am all alone and unhappy and i don't know why i am writing this...it's like when you are successful when you always achieve something great, when people admire you but there is no one with you to celebrate, no one to tell you "I love you", no one to share your knowledge with, you spend the most beautiful moments alone.....and that's sad and i want to change it...i mean i am not that bad?? what's the problem? :S