I never really understood racism until now.
Oh, no! What made this change?
I got a lot of bad experiences from black people.
It is wrong to dislike one race.  There are bad apples in any group of people.  You shouldn't generalize based on an instance or two.
What do you mean by bad apples? The majority of instances were with blacks. They are the reason why racism exists.
Even if that's true, that doesn't mean the majority of black people are bad. Letting go of hate will make you think more clearly.