sometimes people just won't like you. it sucks because you want to be their friend, but they don't want to be yours, just ignore them. [not maliciously, if they say hi say hi back just stop going out of your way to please them]
i don't know of a way to remove hate, but try a cleansing and shielding to remove as much [or all] negative energy from your body and home, then charge shield yourself with positive energy. i don't now if your feelings of hate will go away too, but it will change your mood and make you feel better.