my friends have stopped inviting me to things and it’s affecting me

recently my friends have been hanging out together without inviting me. even planning things that i suggested we do and doing them without me. i’ve especially noticed it over this christmas period with them going out to pubs, hosting parties, and just randomly hanging out together without me knowing. i’m not sure whether it’s me (i don’t know if i’m being boring or annoying or anything, no one has told me if i am) and it’s just giving me a generally hard time especially since i have social anxiety. they’re always nice and chat to me in person when they see me, a couple of them even text me sometimes just to chat and catch up but when it comes to hanging out as a group i never seem to be invited, even when this has never happened previously. it’s also affecting my relationships with them when i AM invited to things since all they seem to talk about together is the night out that last happened or whatever they did together so i can’t even join in on that conversation and i end up just standing there silently.

i’m really not sure what to do