Golf..getting annoyed but really wwnt to improve?

my handicap is 5 and i have been playing golf for 6 years and theres this guy in my club that always calls me **** at the game and tells me he would hammer me in a match and im never going to be as good as him or get my handicap near him is there any ways i can just get from 5 down to like 1 in 3 months and show him im getting better and someday be able to go out and show him he full of talk...also when i hit a bad shot i go mad like curse or throw club cause i think my round has been destroyed over that 1 bad shot and people tell me to relax and u can pull it back but it just gets worse and worse can somebody help me stop giving out all d time and help me get my handicap lower and be a great golfer