I'm afraid to post anything on most social media outlets.
What is your reason for not wanting to post on social media?
I do not want to feel like I am being judged.
You don't need to feel obligated to post on social media, but you shouldn't constantly worry about people judging you. You should talk to someone if the thought of people judging you is keeping you from doing things you want to do. You don't want to miss out on fun things in life out of fear of what other people think.
I'm going to make a selfless post ( I'm sure someone will judge me)
If you do not want to post on social media than you have the option not to. If you feel like people are going to judge you than it may be a good idea to forgo doing this anyway. Do not worry about what people think, as you have the right to voice your opinion regardless.