Do I have autism and/or depression?

I actually feel really weird at the moment for no reason. I have trouble speaking, I suffer from an inferiority complex, I feel empty and depressed inside and I don't feel anything for myself or anyone else (apart from my parents). In the world of PC flight simulators and documentaries I can live out my interest in technology and that's the only place I feel comfortable. I already have a few friends, but when I try to talk to people they always look weird and give me funny looks. Generally speaking, no one takes me seriously. But I'm always polite to new people and I always treat one person in our class who is always excluded well, so that at least they have it better.