Heyy
Well first off I guess i could say i kind of used to be in the same boat. Back in school i didn't really have any friends at all, i was always that quiet kid in the background that nobody realised existed until it was time for class register.After i finished my A-levels i moved to a country abroad to study. I'm now in my second year. And suddenly a switch in me turned on that made me start to open up. Perhaps it was the fact that i was in a new country with a clean slate to start over. Actually, i do think it was partly that. Which brings me to my first point: Meet NEW people. I'm not talking about "new" coworkers or people who live with you that see you pretty often. Try going to completely new places and meeting people that are 8 to 80 years old. People whom you can just be yourself to because it's the first time they meet you, and they have NO idea about your past with social anxiety. Believe it or not, they will treat you differently. And this is a sad fact, that those that knew you as that nervous shy kid before are not going to treat you that much differently, even if you've changed. They'll still (whether they mean to or not) have this old image in their minds of you with the low self confidence and the social issues. So bring a new bunch of people in your life. Expand your horizons. Be open. To everything. Accept everyone of every age and every type. This will really help expand your social circle. And will teach you how to deal with them as unique individuals, give you the skill to tackle different personas, hence attracting an even larger circle.
Second thing, build yourself. I'm talking hobbies, interests, passions, anything that gets you busy and gets you interested in doing it on. your. own. This may seem a bit counterproductive considering you want to be out there being social, but i guarantee you the more stuff you do in your alone time, the more you will have to offer to other people in your social time. You'll always have something to talk about, and your value will increase seeing as you put so much effort into yourself. There'll always be something to talk about. You know what's worse than a friendless guy? A boring guy.
Since we're already on the topic of building yourself, this will also most likely put you on the path of finding a girl you can date. Trust me, the girls you wanna get aren't the ones that have low standards that will just go for anyone that sends them good morning texts. No. You've been single this long, you might as well make your first relationship a good one, and worth the wait. So, start off with making a lot of female friends. Eventually, once she properly knows you and you her, try to ask her out, etc. A meaningless relationship is just gonna suck time out of you and will be something you look back on and just think "Meh".
These are pretty much the things i ended up doing, mostly the stuff above and also just seeming interested in everyone's lives, and listening, making them feel important. This is also a point worth mentioning. That sometimes you don't even have to put that much effort, sometimes a good friend is just a good listener.
Best of luck, and congratulations for overcoming your social anxiety. Remember, new slate. You can message me if you want to talk to someone
I hope i helped.