I hope you can overcome those personal issues soon, and find some ways to start producing more on here. I can understand the feeling that you always need to impress or put hours of effort into each post, but that's definitely not the case.
My advice would be to just say "fuck it" and start posting whatever things are within your interest. If you're a graphics artist, post about that? Perhaps whatever it is you did during the day, or how you did a specific thing. While it can take time to find your place on the platform, it will happen. There will be people interested in the same things you are, you just have to take the leap in discovering them.
Consider Steem to be a place where you can just let go and let out some of your thoughts. Maybe even for your own personal good to remember something or just get it out and feel better. Slowly but surely, you'll find more and more things to post about.