Trust your own instinct. Your mistakes might as well be your own, instead of someone else's.
When you invest your time, you make a goal and a decision of something that you want to accomplish. Whether it's make good grades in school, be a good athlete, be a good person, go down and do some community service and help somebody who's in need, whatever it is you choose to do, you're investing your time in that.
I can prove at any time that my education tried to make another person out of me than the one I became. It is for the harm, therefore, that my educators could have done me in accordance with their intentions that I reproach them; I demand from their hands the person I now am, and since they cannot give him to me, I make of my reproach and laughter a drumbeat sounding in the world beyond.