You accept that you're socially undeveloped instead of screaming that the world doesn't understand you. I've been where you are now, realizing it was me, not the rest of the world that got it wrong.
You did, now it's time that you develop real skills. Joining a social community doesn't help, if you lack the proper skills/tools/mindset to actually make it work. Instead of being all talkative, you end up being a social outcast again.
What I did, is find articles on social interaction, human group behavior, person to person interaction and read them. Work out why people do certain things and start to mimic them, try them out. Don't start out with PUA material, because most of the PUA material is bullsh*t. I'm not going to deny that many of the tricks actually work, but their explanation is nonsense.
Why does kino work? Because it releases oxytocine, a neurotransmitter that bonds people, make them happy and encourages them to be touchy as well. In mothers and babies, this makes sure they bond properly. Why does negging work? Because if you do it properly in a playful, teasing way, it comes off as flirting and everyone likes flirting that way. Not because you DHV, or lower her values or whatever. No, you're just that funny guy.
Parallel to that, I developed a lot of silly tricks to boost my internal morale, grow some self-esteem. First of all, I imagined that was a piece of string attached to the crown of my head. This string pulled my head up, forcing me to look at people's faces while I was walking on the street. At first, I had major problems with this, as my neck muscles were underdeveloped, and it took a lot of effort and pained me. But I persisted, and eventually, I learned how to stride the streets with dignity, look at people and being confident. People stopped bumping into me and actually noticed me and stepped out of my way. Mind you, this wasn't something instant, it took me months to get to that level.
Another trick I used was winking to my self everytime I saw myself. Silly? Yes, but it reminded me to tell myself that I wasn't such a loser as I always told myself. It made me re-affirm to myself, "You're a great guy, you'll get there!". This helped me grow some real self-esteem over the months that followed, and I used this trick for well over 9 months. And noone ever noticed. Just a wink everytime you see yourself in a mirror, shop window or whatever.
I'll continue this later on, I need to run.