May I suggest casual hangouts for a bit before you jump into more tense, drama-filled political organizations then? It might be easier to start with a less stressful environment.
Try meetup.com, FB events, or local subreddits and look for local board game groups, hiking or biking groups, co-ed sports leagues, cocktail networking events, wine tasting tours, book clubs, little things like that. It's easier in my opinion if there's another activity like board games to help facilitate the social interaction. I also recommend finding hobbies or shows you're interested in and going to conventions based on them. You might have to travel a bit if you don't live near a big city. Going back to school can also help you meet people. For me, I'd also go to local bars and places every now and then, even by myself, and look for flyers for game nights or other things they may have.
I know it doesn't answer your other general questions about what organizing or reading theory means, but since one of your big worries seems to be in engaging in social interaction, that's probably where I'd recommend starting. If I'm off base, sorry about that, just trying to help.