Welcome, @Renee74 , it's good to have you here 🙂
I can empathise with your situation as I lost 95% of my friends when I had a 3-year nervous breakdown.
What helped me rebuild was volunteering. You make new friends with similar interests.
Also, like @hanami said, library and community groups could help. If your neighbourhood / suburb has a local Facebook group, they often have events like tree-planting, library groups, social groups etc advertised.
Also, you could look on Facebook for support groups based on social anxiety, to get started. You sound young so you may not be into Facebook! But I find Facebook very supportive.
Also, do you have professional help for your social anxiety? Like a counsellor, meds, psychologist or psychiatrist?
A handy forum tip is if you tag someone by typing @ and then clicking on their name in the drop-down box, that person will get a notification and won't miss your reply.