Touching breasts during sex

Hi. My boyfriend thinks this is weird so I'm posting this to see if anyone feels the same way. I don't get turned on when he plays with my boobs, especially during sex. The outer part of the boob is ok, but the nipples are a big no no. I just don't like it. I think they are so sensitive and it's not a pleasant feeling when someone touches them. Is this normal? Anyone else in the same situation?