Frustration & Disappointment

I'm again in the frustration and disappointment mode.. I don't know, its hard to explain.. What I know is that I feel that I want to be more than what I am, I want to reach my full potential. I am feeling that I was built for more but why I am not able to reach it, I don't know. Regrets of why I took Psychology and not a Management course of some sort. Questions on why now I am just a rank and file employee and not a supervisor or a specialist... Aaaaargh...