Yeah, that would be me too. I only like to hang out with four good friends and my mom. I don't feel comfortable when it's crowded and enjoy being by myself.
It's a part of my personality, and I accept and embrace that, because i like it that way. You know, I've noticed I only like to be around people that are close to me, with whom I have a bond or a few people with whom I "click".
Nothing strange, maybe you might find it that way because you are more of a people person.