Man, I feel this a lot. Sometimes when I'm stuck I'll go read or watch something that I love for inspiration, and it only makes things worse. Like what am I even writing about? It feels like the only way it could be interesting is if you were in my head. Then I'm worried I'm not a good enough writer for that. Luckily my existential side breaks through and I just say, "Who cares. I like writing this story, so I will."
I just have to remind myself that fame has come to shit stories, and obscurity to greats. So, the main battle is to just finish something. Do you find anything helps you cope with this feeling?