I think an important ingredient here is giving yourself credit for the things you actually accomplish. I try to do so many things perfectly that I sometimes fall into the trap of doing nothing. I used to run almost everday for 1 hour and eventually I couldn't do it anymore. I enjoy running, but the pressure I put on myself to run for an hour was too much. And I stopped running for a while even though, a 10 or 15 min run would've kept me in shape. Setting goals is important and understanding some limits is part of being human.