Have you told her how you feel? Maybe she really just doesn't know. I don't think you're being a wimp or too sensitive at all. If it hurts you, then it hurts and it needs to stop. But you need to tell her. I'm sure she doesn't want to hurt you and maybe she just needs your help to understand better ways to talk to and about you to help you feel better about yourself. It's not fair to blame her if you've never communicated with her about it. It's always worth the effort to try and communicate about the problem and see if maybe it's just a misunderstanding. If you've talked to her and she doesn't stop, then there might be a bigger problem, but communicating should always be the first line of defense.