I feel excluded but I am the one withdrawing myself.

I always feel excluded from everything but I am not comfortable having a lot of people around me. I always feel like the black sheep. My social battery gets drained so easily. I live with 3 other people in the apartment. I like to talk with them occasionally but I usually prefer to stay in my room and do my own things. My other roommate is so social with them. I feel like I'm missing out on a good connection with them. If I get into a conversation for a long time, it exhausts me and I don't have much to talk about. However,I have some close friends and I never stop talking with them. I don't like being with a bigger group of friends. I prefer small circles. I am a yapper but it's very selective. I feel uncomfortable in my own space. They judge me for not interacting with them. I don't know how to explain this feeling.