Clubs are a good call. Look into societies at your university, find something that you’re interested in or think you could be interested in. Societies are social in a way that seminars and other course activities are not. Don’t worry if you don’t “click” with anyone immediately, keep attending and do your best to engage in conversations.
I also recommend seeking out a university counsellor. Most universities will have them and their advice can be valuable.
Ah well, it’s a little reassuring that this didn’t just happen to me!
Just a tip if you’ve had your eBay account since before you were 18. Never update your date of birth on either your eBay or PayPal account such that you would have been under 18 when you made the account. I made that mistake and they banned that account, I had to make a new one.
I program for a living and I think of it more as doing the interesting tasks all day, rather than the mundane and repetitive. Chat GPT and GitHub Copilot are great for getting something roughly right that you can tweak to work the way you want.
Best of luck, get well soon
Perhaps you could try friend-finding apps such as Bumble BFF? You’re likely to find others there in a similar position to yourself. It also focuses on 1 on 1 which should be a little easier to manage with social anxiety.