I feel this way too- i'm in A2 now and it's terrible. Worst part is that I'm in the same school I was in for secondary- it's just all my friends left for other school and I never really bothered to branch outside of my group. Now I realise how awkward I am, and I've become so quiet. I think I might have social anxiety now and I've become so scared of university. It's so difficult to get into friendship groups because it's like they're set in stone. I cried throughout last year, it was horrible. I think it completely changed me- its so difficult watching everyone else laugh and hang out with each other and I'm such an overthinker..
I hope university is different..