Help!

I’m nervous about an upcoming gathering. I feel like I won’t be welcomed or only invited for the sake of the host being nice. I am afraid of what I will say or do, that others will pick up on my non verbal behaviors like I do with theirs (i.e. a shoulder shift, eye roll, texting each other while I’m right there etc.) and I’m afraid that I will ruin the vibes of the gathering by becoming paranoid. I don’t want my thoughts to spiral so bad that I need to leave and my fiancé is out of town so it’s not like I can escape. I don’t want to be there the whole time but also don’t want to seem rude by leaving early and keep thinking that if I leave early will be a topic of conversation for others there. It makes me want to curl up and hide in the house all weekend and I haven’t been able to stop thinking about it for over a week now.

Today is Easter and it was supposed to be low key for me and my family but my mom invited a family member that bothers my ocd alot and now they are on their way here and I'm freaking out I already had a panic attack (still having it) and my family is not helping either they keep making comments about how they just want one holiday with no problems and some other comments and it's like I'm sorry I'm not normal like my siblings I didn't ask to be like this now I'm just hurt, upset and I locked myself in my room for the rest of day. (And I was doing so good with erp and this is like making me have a ocd relapse)

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.