If you will change one thing in your life, what would it be and why?

If I can change one thing in my life, I want to fix my personality that I feel easily jealous. I do not know why, but I frequently feel that other people are better than me when it comes to money, appearance or English ability. Since I study English for graduation every single day these days, other people’ great English ability sometimes make me frustrated. I think I study hard as much as they do, but I always find out other people's performance are so much better than me. I don't want to compare my English ability with others but I always do it unconsciously. I have a friend who is one year younger than me and I am very close to her in hagwon. We pretty much study together, eat together and often go back home together. She is one of great students in our hagwon. She is very nice and not boasting her English ability. I like her, but deep down, I feel jealous lot . I feel sorry for her that I feel jealous about her ability. If can change one thing, I want to fix this^^.