What mental-blocks have you identified as a founder/aspiring creator?

I used to be pretty shy and reserved back in high-school days. Lots of self-doubt, low on confidence, not networking or being social, etc.

I believe, most of the times I knew what was holding me back from leaping through progress, but of course it took time to get to a place where I'd completely switch how I operated internally.

I'm wondering if you've ever felt like there are things that hold you back, and what you do to change them (if you do)?

It could be lack of focus, patience, networking, self-doubt, etc.