My best friend told me I was too sensitive
What do you think that she meant by that?
That I need to grow a pair.
It sounds like your friend is being insensitive with you. It is fair to expect your friends to be understanding and sympathetic, that is what friends are for.
It's fine, I don't need her.
I think that you should tell her that it is rude to point out things like that. It is mean and not something that a friend should really be doing.