Play. We often use that word to mean "not serious" or "not work", but children's play is an effort to do exactly what you are talking about - to understand what is possible. Humans are among the most adaptive creatures known. We adapt by trying things, not being successful and then playing with possibilities. If you have anxiety/paralysis about that process then I suspect that is not self-inflicted but inflicted by other people or the institutions you participate in.
There is another factor that causes problems for many people. They don't really give a <insert-obscentity-here> for what they are doing. Bad jobs, stupid ways of doing things, senseless tasks. Just say no. :-)
And finally, we often forget how physically competent we are. Humans can run and walk for hours and hours once they get use to it. Go walk 10 miles. Or better yet run. It helps.
There is another factor that causes problems for many people. They don't really give a <insert-obscentity-here> for what they are doing. Bad jobs, stupid ways of doing things, senseless tasks. Just say no. :-)
And finally, we often forget how physically competent we are. Humans can run and walk for hours and hours once they get use to it. Go walk 10 miles. Or better yet run. It helps.