Welcome to the forums and thanks for joining us.
I'm not sure how much advice I can give you but I thought at the very least I'd wish you a late happy birthday! Unfortunately I only just saw this post so I hope you've been doing alright since yesterday. It sounds like things have been really hard lately.
As much as I hated reading that your mum locked you out of the house, I'm really glad that you were able to talk to her about it. I'm guessing that you've been keeping a lot of this stuff in, especially if you're friends are stealing it's not very easy to really talk to anyone about it!
I also get too that you don't want to speak to a school counsellor, but I kind of agree with your mum on this one and I think it might be a good idea. They're the ones who can listen to it all - alcohol, stealing, anxiety attacks - and not judge you. They also have to keep confidentiality unless you were planning to hurt yourself or someone else, so you could tell them about your friends stealing and they wouldn't be allowed to tell the police or any of their parents (just in case that was something you were worried about).
For what it's worth too, I was in the same boat, with friends that were doing drugs that I was not at all keen on. Kudos to you for not joining in, even though sometimes it can make you/me/us feel isolated or disconnected. For me personally, I ended up staying friends with them but just holding up my own boundaries, and then kind of making new friends at the same time. But honestly everyone is different; I'm not sure what it will look like for you but hopefully if you can maybe manage some anxiety it will help you make other decisions too.