What are the factors that hold you back? Criticism from others leading to self-doubt? Fear of rejection? An institutional culture discouraging research and intellectual pursuits generally? A lack of adequate knowledge or training? Your own bad work habits?
How much of this under your own control? You can control your own work habits to a large extent. You cannot prevent people from criticizing your work or rejecting you, but you can develop strategies for dealing with this. Clarissa, in a comment to the next-to-last post, says she uses the culture of complaint about "how hard research" is to motivate herself to do more research! An unusual response by highly effective. In my first job, I used the fact that some of my colleagues didn't think I was very good to spur myself on to greater things. I was going to prove the assholes wrong in spectacular fashion, and I did. I know it's hard to believe, but not everyone has always worshipped my superior intelligence or praised me lavishly. It's a good thing too.
So your anti-fuel can be your fuel too.