Don't. There's too much stuff on here as it is.
Kidding of course. Get over by it by getting in the comments and writing things you think are cute. People enjoy positive reinforcement, so an easy way to get over yourself and get some positive feedback is to comment on stuff that makes you happy. If I make something you enjoy and you comment some variation of "hey this is really good" then I'm going to feel good and I'm gonna reciprocate that feeling back to you. Then you feel good about posting, which makes it less scary and so you will slowly feel confident enough to comment different things and also make your own post. You will also realise it's nothing to worry about, since its just text on a website. Also delete comments you make that regret. Then you don't have to look at them.