Often, it feels as if simple things bother you and you stay stubborn while facing some of the toughest problems. In reality, you can get bothered of bigger problems or you can stay unmoved of simple things. It's all within you and your thoughts. Catch holding of one's own fears and thoughts which are majorly due to past experiences is one of the important things to practice.
Neither every problem ends up unsuccessfully nor that the so called small things cannot bother you. In life, give attention to every single thing the way it deserves. Capability to estimate the deservingness improves with experience, not necessarily with the number of years lived!