I feel you here, I am a terrible designer. I just redesigned and relaunched my blog with no content. It is a huge step up from what I had before.

Do you have any friends who are designers? What I have been doing is when I see designs my friends make, I ask them constantly(they must be getting annoyed by me now) why they make particular design decisions. Using this knowledge helps me make better design decisions going forward. I'm still super terrible, but I am slowly getting better.