Hi,
I can relate to a lot of your struggles. I realise this is the last piece of advice you'll want but it really does get easier. I can empathise especially to struggling with shared living, in my case I moved myself from shared living into a studio flat in the same accommodation building, which might be worth looking into if you really feel you can't cope with sharing the kitchen and living space. With that said, I think that it might be worth trying to stick it through in shared living and getting to know your flatmates, as daunting as that is. It won't seem like it, but most of them are in the same position you are, some people are just better than others at hiding their anxiety.
From what I understand, part of your "I can't see myself enjoying this" response is likely your brain's misguided attempt to protect you, as avoidance is the easiest way for anxiety to relieve itself. It might be that the urge to drop out and move back home is your brain's way of trying to keep you safe, and proving to your brain that you're not in danger is up to you. It might not be easy, but it's definitely doable.
A piece of advice I can give you is that it's much easier to socialise and get comfortable in a setting that you're used to. I can see by your username you're into guitars, so maybe you could try and find a guitarist/music society at your university that you can meet people at? By meeting people in a context that's familiar to you, it might help you feel more at ease and in turn more able to tackle your other worries.
Most of all I want to stress how normal what you're experiencing is. It takes a very rare kind of person to move away from home and into halls and not be stressed by it, you're not alone! Asking for advice here is the first step, and I hope you're able to take the advice people are offering you into account. Ultimately, whatever you decide to do is your decision, but I'd urge you to really brave it and give it a go at least once before you make the decision to go home or not. Not knowing if it could have worked out will be much worse in the long run than trying and knowing for sure if it will or won't. Hope that makes sense.
Good luck,
Courtney H