Help with a feeling of loneliness despite circle of friends.

i I'm a 15 (soon to be 16)years old girl and I hope you can help me with this problem: Although I have a number of friends at the moment, I sometimes feel very lonely. I have a feeling that many of these friendships are a bit shallow. I can rarely be myself around them and am often anxious about "not fitting in". Maybe a reason for this is that I think and philosophise a lot and there isn't really someone else around I can share those thoughts with. I also have problems with finding new friends, since I'm more of a shy and quiet type of person. Plus I have a taste in music (mostly Punk Rock and metal, but also artists like Bob Dylan), shows etc. that I don't really share with my group of friends, but I don't get to know people with similar preferences since going to festivals or similar alone is not my thing.