I hate my best friend that I have known for a long time.
Why do you hate your best friend now?
She's so inconsiderate. She always does things without thinking about others
There must be other things that you like about her that you guys can be best friends for this long. You shouldn't hate her and throw away this long friendship. Maybe just have a conversation with her and get things off your chest?
I'm going to do what I want. Being nice to her is a problem.
I just think it'd be best to have an honest discussion with her about why you are mad. I'm sure she would change after that.