My own reasons were similar to those of Awen and Hortensia.
After a ten year limbo, I started returning to the bOrg. I too was surrounded with JW's who wanted to go out to eat, hang out, etc, before my baptism at 28. After I got baptized, the friendliness in the congregation towards me started to fade ever so slowly... but I didn't really notice at the time. I admit that with my ADHD I was (and still am) prone to making mistakes and pissing people off... but was that an excuse for them to withdraw from me and start treating me like a piece-of-shit criminal? I think not. A few years and a major romantic disappointment later, I started becoming depressed as hell and it was then that I started realizing some things.
I started to see what a cold, loveless, elitist, superficial bunch most of the people in my congregation truly were. I started to realize that people whom I though were true friends really weren't that way at all. I realized that if you weren't a pioneer, MS, Elder or at least a very close associate of one, you were regarded as a useless slacker. I realized that if you hadn't gotten yourself married off by the time you were in your mid twenties, you're regarded as damaged goods, especially if you weren't a pioneer, MS, etc. The clique-i-ness in the congregation was especially strong and a lot of 'lesser ones' (including me) were left on the outside looking in. And this wasn't just in my local congregation... this kind of crap was what I was seeing in every other congregation that I was visiting too. When I was just a hair's breadth from dropping meetings altogether, I learned that there was at least one rumour about me that was going around behind my back. That made me especially paranoid. It all made me sick and tired in the end. I couldn't take it anymore...