it is said that a man who has succeeded is a man who has chosen one line and stuck to it. I fully agree with it. To my mind, a person can not be successful and happy if he/she must be perfect in everything. Because then one should try harder and do his/her best at everything. In a result nothing will be done properly. Then one can even give up, because a thought of uncertainity in your strength comes.
 And if you chose what you like most of all and develop your skills in it, you'll achieve success and you'll want to do it better. But, unfortunately our education doesn't allow us to do it...