I sometimes think of posting confessions here but I get worried my grammar gets criticized
Have you been criticized about your grammar?
It has happened to me in the past.
I would encourage you to put your writing out there, even if you are worried about getting criticized for the grammar. Most people will appreciate honesty and not worry about the grammar.
I'm just not sure if I will get criticized and have to deal with it.
It would be good for you to put your writing out there; most people will be kind in their comments so you shouldn't let others who are worried about grammar hurt your feelings. Publishing your thoughts and feelings can be very therapeutic and good for your mental health.