Sometimes writing it out, to just let it out, then deleting it helps.
It is very hard to express ones self to begin with. Even more so because people can be very critical of others.
What’s really the worst that could happen if you posted your stress, worry and fear. It would show your humanity, that you are a human being. That life isn’t always sunshine and rainbows. That sometimes the weight of everything does get to you.
If someone is critical of what you write it is a reflection of them, not you.