Yeah, it really is hard. When all I can feel is pain and all I can see is darkness, I try to remember times I've felt and seen better things, and remind myself that those things still exist, I'm just currently blinded to them by my mental illnesses. It can be incredibly hard to remember, but I find it comforting when I can reach that place and know the good parts of life are still there, and will be waiting for me when I feel better.