I feel you on this big time. It goes without saying that rejection is hard to deal with. This past year I have been getting back-to-back rejections on jobs, residencies, grants and open calls. It's been difficult. I like to think of it as a mourning process. I give myself the time and space to feel sad and angry by the rejection (i.e. eat comfort food, be around my friends or family, watch anime, or sometimes just self-isolate for a bit). I don't like to shy away from feeling hurt from the rejection because it helps me get over it and move on to my next goal or game plan. That is why I make sure I don't check my email unless I'm in a space safe enough to feel these hurt feelings, in the case it is a rejection. I don't want to be caught crying in the middle of work hahaha.