I really do not know what to do.

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I know not with what weapons World War III will be fought,
but World War IV will be fought with sticks and stones

Try remembering why your friends with the people around you, what you had in common when you first started being friends & then try to do stuff with them that you can still remember having fun with. Like for example if you like the same music, go to gigs together. Try to interact in social situations that you remember feeling positive in before, but that are possibly more stimulating than just sitting around & talking, if you see what I mean.

With new people, I would personally wait until I was feeling more confident within myself before putting myself in situations with strangers. However if you do find yourself having to make conversation a good fail-safe is to just ask questions until they tell you something you can talk about. Or they ask you questions etc. That should start up some back & forth between you where you can start to feel more comfortable in what you say to them.

It's just about finding your confidence again, so do try to do things that your good at, that make you feel good within yourself. Hopefully this will make you feel better in groups as well.

Good luck & I hope something there helps.
- Jess

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you'd be a rubbish squirrel

I think an easy way to start working on this is talking about anything. Say whatever you think about. Think out loud occasionally when you're around people and see if anybody laughs or responds. Talk about trivial things with people you know just for the sake of conversation, and then they're likely to continue the conversation.

You can also try hanging out with people more....You don't have to be social through talking. It can be whatever activities with them. See where your opportunities, even if you don't think you have many.