>I had been to practicing for 4 weeks and I feel miserable in there.

4 weeks in a martial arts class? Sorry to say this but what you wish for can't be rushed. You only start relating properly to people and getting their respect (in martial arts classes) once you achieve some decent things and skill knowledge and things like that.

It's not a way to socialize, it's a martial art, remember, that's what you're there for.

And if that's not the reason you're there for then just give it up and try something that can also get you friends but that demands less from you and your body.

Good luck.