No one said that left-handed people must be good at math and singing. However, some studies have proved that left-handed people can exercise their right brain, which can improve their logical thinking ability, so it is good for learning mathematics. There are two reasons why you are not good at math: 1, and your math intelligence has not found room to play. For example, you are studying function now, and your major is space geometry, but you just haven't found it. 2, the teacher didn't teach well, didn't let you improve your interest in mathematics, because interest is very important (I must make students fall in love with my class when I become a teacher in the future! ) Music is also related to two factors: 1, which is influenced by your parents' inheritance. 2. You have to try to change the genetic influence of congenital bad the day after tomorrow. You lack special vocal exercises. You can find a teacher or classmate who sings better and learn from them ... I wish you success!