I don't... Hahaha this is one of the things I most often speak to my counsellor about though and I'm working hard on it.
My issue is more around productivity (achievements), so what I work on is doing things for the sake of doing them, not for the final product, i.e. doing art for the process or even playing a game just to play and not for literal achievements. Learning to just enjoy things for the process or just doing 'nothing'. They suggested I could just come home and sit and watch my cats and... Just do nothing. I'm still working on that one.
We haven't gotten that far into external validation, but I think learning to have compassion/love for yourself helps with that.
I feel you 100%, I have the same voice. If you want to watch something truly depressing but extremely relatable, the episode called "stupid piece of shit" from bojack horseman covers the topic in a much more real way than any cartoon has the right to do so.
We can get through it though, the voice is a liar.