HATE IT WHEN HE SUCKS MY BOOBS!

Ok...so I don't HATE it... But I find my boobs are very sensitive to his touch...It wasn't that way with past lovers. It should be a good thing I guess.... But whenever we have sex and he gets to my boobs... He'll start licking and sucking and I get all tingly and squirmy. It feels good to a point... But After awhile I just get so overwhelmed with all the feelings that I just want him to stop. Yet he won't!!! That's when he'll pin me down and keep pushing me to stop squirming. My problem is I'm starting to wonder if he does it for me or for himself.... because if it's for me... do it for 30secs to a minute and move on! Don't camp out there like it's the only thing you've got to do. he'll spend so much time on them all I want is for him to just stop... I'm worried because I don't know what my problem is.... Any woman would feel good so why don't I?....