I still have a hard time in mental arithmetics. During my school days, this is one of the things which had instilled the "math phobia" in me. I never really too

I still have a hard time in mental arithmetics. During my school days, this is one of the things which had instilled the "math phobia" in me. I never really took an interest in math, until I started doing competitive programming in college. I had to literally build a new understanding of division, multiplication, modulus, etc., it's difficult to explain. But I feel really ashamed in admitting that I still suck at math, probably because I just hated it during school days and no one was there to guide me. I don't really like blaming things on others, but I am not sure what else I could've done to learn math.