Did you do wrong? No, of course not. Could you have aired it in a more constructive way....yeah, probably.
But, what's done is done. While you can still delete it, some people will have seen it already. So it's out there. Is there any kind of fallout that can come from you posting it? If there is, all you can do is damage control.
You made the decision to post it, to get it out, which ultimately is a good thing, because you shouldn't keep all that bottled up inside you. I wouldn't stress about it. Maybe someone that loves you will have not known and can help you through it now. Do you feel better, now that you've gotten it out? That's really all that matters.