@Moi, you really should move out, the toxic environment doesn't do you any good... Are you sure there's no way for that to happen?

Sucks. I take it you can't really find a job either? Would that remove the disability check? Or your disabilities are so severe it's just impossible?

Brb having Katy Perry flashbacks

You're hot then you're cold
You're yes then you're no
You're in then you're out
You're up then you're down

@Moi: I believe you 100%, I was just wondering what your situation is. Sometimes people don't see the chance for change even though there is something they can do to change things. Maybe it's just really hard to do it and they quit before they try (like my mom, I'm working on her, still...).
I totally understand if you don't feel like you can function and hold down a job. Though sometimes we doubt ourselves too much and we're actually stronger than we think. I don't know your exact situation tho, so it's really not my place to say more. I'm also not a specialist so yeah xD
I just wish I could help people

I get agoraphobia. I don't have it, I'm just an introvert, but even talking to cashiers is stressful to me too, so I kind of get where you're coming from. Of course I know your thing is completely out of my scale though.

I agree that people don't think something might happen and then it happens, but I don't think it's worth it to bottle yourself up in the house and never going out. Sure, scary things might happen, but they don't have to happen. I live in Poland, so it's very safe here, but even in the US I get an impression the shootings only take place in places with a lot of people, like events, schools, concerts etc. So if you avoid such places you'd already be safer :)
I also believe in the law of attraction, so if you keep thinking negatively, more negative things will happen to you, because you attract them with your thoughts.

But your therapist is right, it's how anxiety works. And it's not stupid, it's just how it is. If you call anxiety a stupid mechanism, then you basically call yourself stupid for having it (law of attraction again, if you think you are something, you'll get everything that proves that thought despite it being a lie). Maybe what your therapist meant was, it's okay to be anxious. Having anxiety disorder and attacks is okay. Maybe if you give yourself permission to have it you'll deal with it easier.

For a long while now I've been cherrypicking the negative voice in my mind that tells me I'm and idiot because e.g. I didn't put my PC password right. So I pick that thought, I tell it a big fat NO, I'm not an idiot, I just clicked too fast and missed some letters, it happens. I type fast because I'm impatient and I care.
This way I'm trying to improve my self-esteem and it's working. I know it sounds silly and it's basically talking to yourself and finding an excuse to why you "failed" to do something "right", but even if I scold myself for something so trivial as a wrong password, I'll be a lot harsher to myself for something bigger, like being moody during pms and lashing out at someone.
It's important to start with those small things, the silliest ones and at first it felt super weird to just talk to myself like: *does some insignificant thing wrong* Idiot, you can't even do that. NO. I'm not an idiot, I'm human and humans make small errors like that. It's okay, and it's no big deal. I'll just try again."
And with bigger things, like lashing out, I'll just admit to myself that yes, I was wrong, I could've acted differently. So now the thing I can do to fix it is e.g. to apologize.
I give myself the right to "fail" and "be wrong" and to be "imperfect", 'cause that's my biggest problem. I want to be perfect and for people to like me.
The more I notice I'm the one putting myself down, the more I fight with it and the less frequent those negative thoughts are.

For you, it essentially shouldn't matter what your family thinks, because sure, they're the ones who put you down, but do you do anything to contradict that and protect yourself? Or do you just agree with them and tell yourself you're stupid for having anxiety over having anxiety?
What YOU think of yourself is so much more important than what other think of you, even if it's your family.