stop crying about it and let it go
As someone who graduated from a very tough design program, Jack Moffett’s advice on disowning design rings true:
It can be devastating to have a project that you spent a lot of time on and thought was decent be ripped to shreds by your professor and peers. It is, however, a necessary experience. One must not only learn to accept it, but embrace it—welcome it, knowing that it will make the end result better. To do this, you have to disown the work, and see it as something other than yours.
On a slightly exaggerated level it calls to mind Alec Baldwin’s epic scene in Glengarry Glen Ross:
You think this is abuse? You think this is abuse, you cocksucker? You can’t take this — how can you take the abuse you get on a sit?! You don’t like it — leave.