I need advice

So ever since I stopped being friends with my ex bff I’ve started comparing her to how much she hangs out w her new friends and I get really annoyed and feel like I need to be out whenever I see she is. How do I stop comparing myself to her?

Also one of the reasons I stopped being friends w her was cuz she never wanted to hangout and was super.. I guess anti social. Just a bad friend over all and I told her this. Ever since I told her it’s like she’s been making an effort w her new friends to hangout all the time. And when we were friends I would try to get her to hangout like all the time and do fun stuff but she always said no.

.. I’m really I just have a problem overall when comparing myself. My brother was always the super popular kid in school. Partied all the time, has great friends, and I’ve always envied that. I always tried to “mimic” some things he did and now that I’m the same age that he was when you started having fun, and I’m not doing any of it, I’m kind of sad. And it’s not like I’m not trying. It’s just my friends don’t have this problem plus they have other friends they hangout w without me so they can’t hangout whenever I want to. Plus I only have 2 friends now. I want to go to parties but I’m never invite to any and, idk. This is why I’m getting jealous that my ex bff, who never wanted to do any of that, now is and I feel like it’s not fair. And ik I sound 12 rn but that’s just how I feel and I hate it.

Like I’ll get anxiety just thinking about how I’m missing out and could be having fun rn instead of home alone mooing. SO can someone plz help?! Might post in multiple topics here to get replies.