Why everyone hates me? I want to DIE?

Like I'm 16 years old and my birthday is near. This is the last year of my schooling and I want to take all my friends out for a treat! But I feel everyone hates me and no one like being around me. I am humorous, I am the fairest in my cl and I am really smart. But I'm very short.I'm so short (Only 5 feet 5in) and have lots of pimple scars. I have a few good friends but they are NOT as close to me as they were before. Everyone has lots of friends and usually I'm lonely most of the times. I have a girlfriend whom I really love Allot, and want to be with her. We both are in a very serious relation. She doesn't speak to other guys for me and I do the same. But recently she too went away from me. I have no in my life...She was the only one. I did everything for her,everything.Am I so bad?? I don't use foul language or anything! Am I so bad.....I want to DIE....