When you have been an entrepreneur long enough, you get used to doors being shut on your face to the extent that you don’t waste time being emotional about the closed door, instead you move on to the next possible door…. Until one door opens or you decide to create your own door and open and close it as you wish.
There is not point crying over spilled milk, in essence the world owes you nothing… Dust yourself off and move on.
No need to take offense when doors are closed and locked for you.
Better to just leave offense on the table and walk away.
Offense untaken quietly disappears.