Decision Making

I had made a wrong decision today, although it is a small thing, it really affected my emotion. It let me realized that not every decision that we make is right, we need to go through some incidences to let us see what's the things we need to improve, to lead us be nearer to 100% right decision. I really need wisdom from God to lead me. I had once thought that I just do what is best for myself, I just enjoy myself, no need to think about other people, that will only burden myself. My heart can not take it, too many emotions in my heart. But is it really the right way?