Hi, I used to be a lot worse than you! I to struggle with similar issues in social situations at times. It helps that I'm on the right meds now, lol. Anyways, congrats on taking these courageous steps to try and meet more people.
It's very hard, so just take baby steps. Don't do to much at once. Perhaps you can just start talking to one person at a time at a party instead of a group? Practice being social by talking to cashiers and sales people. I used to avoid talking to just about everyone in the past, but now I can make small talk almost as easily as a so called "normal" person can.
Most of all, always surround yourself with positive and supportive people. Those people who might end up putting you down for not being social enough or "weird" are toxic and stupid and they should be avoided at all costs. I hope this helped you some!