This is more or less what I have been striving to do. I've spent most of my adult life letting my emotions cloud my judgement which has done nothing more than hold me back.
Fear, sorrow, envy, and anger have been especially the worst emotions for me because I was always scared either of the world or other people and as a result, I was always sad and alone. I also envied other people who had it better than me; playing the victim and lashing out at those who rejected me or who had something that I wanted was a favored pastime.
The only logical thing to do is to tackle life with a clear mind and not let one's feelings get in the way of getting what you want.
In fact, a friend of mine once gave me some of the best bit of advice I could follow: "If you stop reacting out of fear and instead look at everything with a clear mind you will become a dangerous, powerful person"; I am inclined to agree.
We all grow up sometime I guess even people as stubborn as myself