This is a great and wise reply. I too suffer from what you're describing sometimes and I attribute it partly to these sorts of underlying emotional factors.

The real key for me now is feeling that I am enough just as I am. I still strive in my career and in a few hobbies, that's still important, but I try hard not to identify too much with them. I fail quite often but it's liberating. I try to frame my passions as things with intrinsic rewards and not things that bolster my ego.