Sitting with the anxiety rn I feel terrible and guilty

How do you sit with anxiety? I wanna check my pulse over and over again. I dunno what caused my anxiety. Now I am just sitting here. Ugh! I feel crazy!

I feel so horrible and guilty, I've been pretty depressed lately and I don't know if i'm doing something wrong or not but my mom keeps getting mad at me, and I keep getting snappy with her. The other day she tried to take a selfie with me and I kinda got mad at her because it was in front of everyone and I didn't want to get anyone uncomfortable if they were accidently in the background so I told her stop in a kind of mean way. She stopped talking to me for the rest of the night and she keeps bringing up how disrespectful I am. I tried to explain to her I didn't mean anything mean by it?? It's triggering my OCD so bad and tonight i'm going to see a band I really wanted to see, and i'm super afraid shes gonna start bringing up how mean i've been lately. I've been really depressed and upset because of school and how much work their giving me, and I've been in my room for mostly more than 10 hours a day doing nothing but watching TV because I can't bring myself out of it, I don't know what to do anymore and the guilt of me possibly being a mean and aggressive person is haunting me.

I’ve posted something vulnerable here before and I’m trying to ride out the wave of reassurance where it’s getting at me and I’m scared of sitting still with nobody to talk to about this at the moment I genuinely think it would be easier if I wasn’t around. I view my friends as pure compared to me and I’m the most impurest. I feel like this would do a favour to stop being here I don’t know what to do, I really don’t know. I’m literally alone in this and I’m getting tired. How do you deal with stupid choices that you made as a child? I’m trying to be understanding of past mistakes but it’s gut wrenching to try and accept to say and admit you did it knowing you’ll spend the rest of your life with that guilt..is there another perspective to this..???