In my experience internalizing ideas as "throwaway garbage" only serves as further demoralization that I'm a hack that won't cut it. That mentality doesn't help either. It's a matter of practicing and exercising discipline, which can be difficult for a variety of factors
this problem goes away when you treat your ideas as throwaway garbage that exist only as a starting point for the creative process. when you fall in love with what's in your head, there's no incentive to make it real