Every artist, every creative being at one time or another has to stare down the enormous giant of self-doubt. If you expect to produce a body of work worth the journey, in any discipline of the creative arts, you must learn to survive that overwhelming desire to self-destruct.
Wrestling with that critical voice inside that convinces you that it's better off to just quit, is almost a right of passage for artists. It's much like a dark menacing forest that seems to stretch on for miles, if you can find your way through to the other side, everything will appear much brighter and clearer in the full light of day. The lure of self-destruction is a trap that must be overcome with care. Negotiation is futile.
In those moments of self-doubt when you feel like your work is entirely insignificant, it actually feels like an accomplishment to simply trash it all. That too is a deceptive trap. I just battled the exact feelings again myself recently, even though I thought I was somehow immune to the voice of that old familiar friend.