I must say that that is an Awesome question. I am not a Doctor as yet but my best friend is. I asked her a similar question one day and her response was quite heart warming, She said that one of the best Aspects of being a Doctor is that you are given the opportunity everyday to change lives. Always remember that when people are sick they are very vulnerable. The respect, care and love shown to them goes along way in nurturing them back to good health and that is one of the hallmarks of being a Doctor. You have indeed chosen a noble profession . and I wish you all the best in your future endeavors.