TL;DR - your expections are too high!! You have picked up a hell of a lot of knowledge over a long period of time, your expection or wish is to get to the sam

TL;DR - your expections are too high!! You have picked up a hell of a lot of knowledge over a long period of time, your expection or wish is to get to the same level of expertise in this new framework. So you're pushing yourself and become disillusioned with the speed of progress.