Focus on impact, not approval. If you believe you can change the world, which I hope you do, do what you believe is right and expect resistance and expect attackers. Keep calm and carry on!
Lacking an external focus, the mind turns inward on itself and creates problems to solve, even if the problems are undefined or unimportant. If you find a focus, an ambitious goal that seems impossible and forces you to grow, these doubts disappear.
Being selective-doing less-is the path of the productive. Focus on the important few and ignore the rest.
Focus on being productive instead of busy.
Avoid results-by volume approach, instead focus on few critically important but uncomfortable actions.