It's hard when folks all around you are into something that just doesn't "float your boat" and you feel like you are on the outside looking in. I think the important thing to remember is that everyone is different yet many have the same ideas, want to talk about the same things or be involved with the same things.
Another important thing to fitting in.....you have to decide what you are interested in and do some homework to figure out where you can find like minded people that would like discussing or doing the same thing or similar things to what you appreciate.
You may even find that some of those women in the group that are all talking about sex on a one to one basis may not even go there in their talks with you. Sometimes reaching out to someone and saying something like "hey, I'm going to go get a cup of coffee, would you like to join me?" is enough to break the ice with someone. From there you can find things to talk about on a more private level and hopefully click and become friends.
It's hard finding a way to connect with others. Many many years ago when I was a teen trying to fit in, I was so lonely almost all the time. It didn't matter what clique there was in school, I didn't fit into any of them. I did find though, that if I had a chance to speak with someone one to one, there was more acceptance and learning about each other and we were able to break the ice some. From there came more acceptance and connection.