YES!! I suffer from this MASSIVELY! Especially having studied music making in some shape or form for the past 7/8 years. All I can thing about is what I should/could be doing instead of just doing it!
I’ve decided I’m gonna try and forget as much as I can about what I have learned. And also follow some of the advice and ideas here about easing off the constant external stimulation of music/tv/internet. 
and just. make. music.
…I might watch that TED talk first though! 