This girl has, for what ever reason, decided not to kiss you. It's doesn't make her retarded, it doesn't make her weird, it doesn't make her a bitch. It's her choice and she can do whatever the fuck she wants. She doesn't owe you anything.
That being said, you have to figure out whether you want to be with her and tolerate her choice. If you want to date someone you can kiss thats fine, break up with her, that doesn't make you a bad person. However, don't stay in the relationship and then pressure her to kiss you. You have no right to do that.