One step at a time. We all have crappy days, and they will keep coming until we learn the lesson: overcoming, getting through bad times, proving to ourselves how relentless we are to go for our goals, no matter what. I believe that our human psychology gets strengthened by understanding the good that comes from making the effort. Exercising that "muscle" just makes it bigger and eventually we act fearlessly in life, instead of reacting to things, we feel like we are in control of our emotions, at least.