> if I look back at the list of things I have done I am happy enough with myself.
This is so true, and can be extrapolated on a micro-level, by tracking what you learn and accomplish on a daily (or whatever) basis.
I've found training your attention this way a great hack for building confidence and momentum. It's kind of like watching a plant grow. You normally don't notice all the little things, until it adds up to magic.
Shameless plug, but one thing I'm proud of building was a micro-notes app for tracking these micro-accomplishments. https://www.bicycl.com
I may be clueless, but at least I have tried many things. Some even worked!