I just don’t want to live!

Hello, my name is Viktor D.
I’m from Serbia, and I have a lot of emotional problems, along problems with people.

I am a metal-head and people who don’t know what metal is and how good metal-people are, and that they also have emotions, and can be soft and good to other people and nice, polite etc. but when I see other people who don’t understand what it is, and when I see them make fun of it and me and my friends, it makes me burst with rage, but then I understand that even if they somehow get better and start to understand, there are millions other who would do the same, it makes me feel like it’s hopeless. And there are a lot of other people who are just simply dumb or stupid. I mean really stupid, not stupid as in “has less knowlegde” I mean, stupid as the fucker doesn’t know anything. He is clueless. And it just makes me wanna kill myself, so I don’t have to suffer from idiots like that. I have a girlfried that I really love and I feel like she is loves me because I am a good person, nice, soft, caring, thoughtful etc. She is the only reason I want to live now, but when I feel like she just wants me when she is in a good mood then I get depressed and shit. I simply want to die, but I can’t since I want to take care of her and make her happy. Any solutions?