I don't have a proper friend/cof

Pa rant lang po, please don't mind my grammar and how I phrase things since I can't express myself properly in words.

I am in grade 12 right now and lowkey feel lonely. I've been thinking about this for months now, and it honestly makes me quite depressed. First off, I do have friends. I have this circle where we've been friends since grade 11 and always go out together after classes. But the thing is, they have other friends that they are even closer with because they're outgoing and sociable people, which is the complete opposite of me, who has social anxiety. I like them btw, I enjoy hanging out with them and they are genuinely good people, it's just that I can't keep up with them.

I know that this isn't the worst thing, or even a bad thing really, but it still gets lonely when I don't have a group chat to share what happened with my day. And I know some of you will say that having one true friend is better than being in a cof, but even I don't have that. Before, I guess I could say that I did, but now she's found her own cof and I'm really happy for her. It's also not that they make me feel left out, I just get tired often and opt to stay in the classroom rather than go outside.

All in all, I have a lot of friends, but not one whom I can genuinely say is my best friend/circle. Thanks for reading my rant :)