I post because I feel safe here and I genuinely appreciate the advice I get. Oftentimes just having someone respond when I'm feeling crappy lifts my mood. Or just having someone to talk to. I also like to help others, so if I can make someone else feel better that's a good thing. At this point it's more about socializing and learning new things rather than trying to improve my SA, because I honestly don't think there's anything more I can learn about that. I'm working on that in real life and only sometimes do I talk about it here.
Another reason I continue to post here is because I've been a member for two years now and I know people around the site. There are people I keep in contact with. And it isn't playing favorites - everyone finds certain people they click with more than others. I am always open to meeting new people as well.
As for what Unspoken said about toxic mental health forums - I'd say maybe find people who are more positive. The group of people I talk to on a regular basis here does not bring me down or make me feel like I'm regressing. Everyone has bad days, of course, but on the whole I've found that most of my friends here are hopeful, helpful, and fun to talk to. I think it's all about who you choose to connect with.
OP, feel free to post here, this is - in my opinion - a pretty decent forum for social phobics. And welcome to the site!