I don't think you should leave. It'll be the board's loss if you do.
Whenever something like this happens, it's seems to often include something by the poster along the lines of how they don't like what they see in themselves, and so it must be time to go. But, in my opinion, people leaving is usually more a reflection of the board than what's wrong with the poster.
Everyone has things to contribute, and those different perspectives are what make this place interesting, lively -- worthwhile, despite its/our faults. If you're not always the best version of yourself, well, there's nobody who always is. And you can always just use the "ignore" button, or not respond to a post, or turn off the computer for a while, or take a few days off, or share less or yourself so that you're automatically less of a target, etc. You don't need to leave.
Take it from someone whom I know some here see as a Bible-thumping, homophobic, pedophile-loving racist, because I've been called all of those things, on here: You don't need to leave.
You just need to know, yourself, who you are and how you are, and stick to your principles, respecting them, and being genuine, and being open enough to others' thoughts that you can have and hold a discussion. You know, because it's a message board, and that's what it's for.
