I don't feel anything when my boyfriend sucks my nipples...

Is there something wrong with me? He does it a lot, and I don't feel anything. I don't think it has anything to do with how he does it. Even if I touch my nipples myself I still don't feel anything, it's just not sensitive at all. Like I may as well be touching some random spot on my back or something. I saw girls on here say that it can literally make them orgasm, so wtf is wrong with me?!