Are you being pressured by outside sources to do something you don't want to do? Perhaps your family really wants you to become a doctor but it is just not your passion. You have to realize that if you hate something but your family is pressuring you to do it, they are really only thinking about the money. Think about it. Why would they want you to do something that would make you hate your life?
When it comes down to it, the thing that really makes you happy with your life is performance. Aren't you the happiest when you're at your best, growing, and continually disciplining yourself? I dare you to think of a situation that contradicts this. Following a passion definitely helps you perform at your best but I want to talk about what helps you stay at your best. I had a mentor once who explained three theories that really affected performance in general.
The first is the theory of results which is the lowest form of living according to him. When people live in the state of results, they usually focus on whats happening. It's kind of weird that we are talking about performance and this first sate is essentially the worst way to live.