What am I doing wrong?

Hey! I (F22) have never truly had problems making friends nor have I ever had an issue keeping them. But I'm growing concerned with how I am socially right now and was hoping someone could give insight? When I was 16-18 I truly enjoyed hanging out with my friends and I never had an awkward time. By awkward I mean, I never really thought about what I said before I said it or worried that nobody would agree.

Now, when I'm with my group of friends (a different group who I enjoy and have been friends with for a while) I am always worried about what I say, who I look at when I talk, if they get annoyed if I do or do not agree. But this group has always been welcoming, has never said anything passive or mean, and is a joy to be around. Also nobody has noticed (thank goodness) my uncomfortablilty and nobody has ever considered me to be awkward. Not with this friend group. Also most people consider me to be joyful and nice so that's gotta show for something.

I love to hang out with them and sometimes IM the one who asks to hang out but then all I want is the company and I don't want to SAY anything. But I'm okay with that!

So what am I doing wrong? And how do I fix this issue when I shouldn't feel like this with my friends. Even close friends who are like family.