it’s hard to be brave enough to approach new people
I was talking to my wife yesterday about how I gained social skills as an adult, and part of it was making a deliberate effort to start conversations with at least a few strangers everyday. Not hold a conversation, merely start one. Doing this for a while helps you get comfortable making chit chat and feeling out of its worth continuing a conversation, and breaks down the idea that every conversation has to be meaningful.
Not sure if this helps you, but it really helped me.
As for where to go, look for gatherings like flea markets, car shows, street fairs, anything. Even if you don’t care about the topic, be there for the people, and keep an open, curious mind. Maybe even make a game out of it, like the meow game, or some other goofy phrase, or try to ask a variety of people the same question. Or bring something that is a conversation starter like a dog, or juggling balls, or something small related to your furry hobby. The idea is to be around people in a mode that makes interaction easy.
Meeting people is just the first part though. Moving on to friendship obviously takes more work and time.