“Every writer I know has trouble writing.” – Joseph Heller
I love seeing quotes like these. Writers tend to be a solitary species, in my experience, so I think can sometimes talk themselves into believing they are terrible, just because they are having a hard time.
Well, every writer has a hard time, even the best ones. Being good at something doesn’t mean it’s easy. In fact, I’d say the better you are at something the more you realize you have to learn, and the more you push yourself.
So revel in the difficulty, and congratulate yourself for still doing it!
Jonas David 
If it was easy etc etc. I like* it when people casually talk about writing a book one day, as if you’d say the same about flying a 747.
* I don’t
Ugh i know what you mean!