Guess what. Schools over.
You’ve posted honestly and who really cares that some students have read your posts.
Nothing to be ashamed about as this is a big decision for you. And quite honestly most people are really focused on themselves. You didn’t put anything out there that would remotely be worthy of concern. And no reason to crater to the juvenile mob at school. Literally who cares.
It’s water under the bridge. Two months from now they’ll be a distant memory. And when you come back for your 10th year reunion they’ll all be talking about how successful you’ve become and this process won’t even be a blip on the radar.