No one is good in everything that they do in life. Everyone has their strong and weak points because that is how God intended us to be. In order for us to function as brothers and sisters, we have to come together and expel our strong elements so that we can create a great life together. God gives everyone their own talent, it is up to you to identify it and make the most out of it.
Never be discouraged if you're unable to accomplish perfection in everything you do. Stay on the path to finding your strengths and once you find them use it for the greater good.