Too late to join a new group of friends?

It's my senior year in high school, and since about 7th grade I have had the same group of friends that i hang out with basically every weekend. Though I am friends with a wide variety of people in school, this group of friends is the only group I ever hang out with out of school. I'm not ascribing to a clique or anything, but they have been the ones i am comfortable around.

And now i am realizing that I wish I was in a different group of friends. I feel like i have matured much more and am constantly wishing I had some good friends to have serious conversations with, but the people i've been friends with since 7th grade only seem to care about video games and tits and boring metal music. They're still my friends but I'm sick of the same old stuff.

So recently I've been trying to hang out with new people who I know from school who seem to share my interests. The only problem is these people have already been friends for a long time and I feel completely left out because they are all so comfortable around each other while I am the odd one out.

Is this normal and what should I do?