First of all, you can start with some simple math problems, and don't care too much about how much you got right at first. You just need to finish them carefully and do them many times until you really understand them. Slowly, you will have a sense of accomplishment and like math. You can finish this process in a little time, but not too long, otherwise it will increase your pressure and hate math even more.
Secondly, you can learn math through what you are interested in. For example, find some small games about mathematics, or watch some small video screens that can learn mathematics, and let you fall in love with mathematics from places you are interested in.
Finally, and most importantly, think about what causes you to hate math, and then start from these reasons to solve it. If you really can't figure out what the reason is, you can ask your friends around you, or your parents, and let them see what the reason is, so that you can solve your problem with them.
I hope the above suggestions can help you and make you like math as soon as possible, at least you won't hate math anymore.