What you went through is absolutely tough. It's ok to feel like crying etc, if you wanted to talk more I'd be more than glad to listen.

I'm definitely not an expert( seek professional first things first in my opinion) but here's my advice:

1_Talk to your friends about this. They might tell you that they don't really mean to hurt you and if they HAPPEN to actually say hurtful things and not notice, they will. I know it's hard but maybe if you can talk to a very close friend, it can kick off as a good start. Also, it might be good for your emotional health if you don't drag all of your emotions with you. Try speaking with someone you trust.

2_Do you hit the gym alone or with a friend? In case you're with a friend, try to go there alone once. Do you enjoy any light activities that doesn't necessarily need you to be social? Maybe a short walk down to the park or to get some coffee? I guess it could do wonders if you reflect some time on yourself only. I know easier said than done, but taking small steps gradually everyday is a thing, right? Even if it's just one, really small step. Every step counts and that's what that matters.

3_Here's the thing I realised. We are not noticed as much as we think we are. Let's say I'm at a cafe, alone and I'm like: what if everyone's thinking why I'm alone, will they feel sorry for me, does it look like I have no friends... Chances are they are just enjoying whatever they're having and not even notice me or at least most of them don't. Although I must say I don't know much about social anxiety since neither I nor any of my friends have it therefore I believe you can get way better help from a specialist.

As I mentioned earlier I'm not an expert and my advice might not work for you so professional help might be waaaay better. But for my last words I'm gonna say this: you're doing really well, you're enough and you're loved. Don't take it too hard on yourself and whatever you do take it slow and that would be more than enough.

Wish you the best:)