Exposure therapy. I went through a period where I couldn’t step out of the house for years without a panic attack. It was a long and difficult process but in time I managed to get out there and feel only a bit of discomfort. Eventually joining a meetup group and with a little help from alcohol worked through my anxiety of being around people as well. Took meabout.. I’d say a year and a half to do it all. I still got work to do, a lot.. but it’s the only method that helped.
Really just need to force yourself into uncomfortable situations.