What's happening inside of home we can never know. Some people seem like they have it all going on. I know a couple of people like that and they've both privately confided to me how unhappy they are. Not saying your friend is, but it is easy to project things onto people. We all have our unique set of qualities. I remember the best math teacher I ever had in school was an English teacher. Because math wasn't his strong suit, he had empathy for people like me. He helped me learn where greater minds couldn't. Empathy would seem a better quality in this example than aptitude. Keep on trucking!