Am I just overthinking?

I'm the youngest person in my friend group and most of the others are really close in age but sometimes I feel I annoy them somehow. Like sometimes I'm having a conversation with one of them and I say something and they don't look so interested and it makes me feel dumb and awkward, and sometimes I just thin of leaving the group completely but it's not like I can avoid them because we go to the same Church, Youth, and they are friends with my brother. And one of my friends in the group in literally dating my brother so.