Answer:
Admitting most things are out of my control and learning to accept what life brings and deal with it rather than let it bother me emotionally. I let every small good thing outweigh the bad. I had a rotten day at work? That's sucky but hey, my toast was perfectly toasted today and the super Market was having a sale on tea so I got to try something new cheap!
It's hard sometimes, but if you can train yourself to smile every time you see a nice flower or a cool bird etc it means little things makes you happy and it all adds up.