nahh...your not selfish, your probably just afraid that if u or someone else offers the baby the bottle often, that perhaps he may loose interest in the breast, let ur husband become aware of this and how important it is for u to give the baby the best and things should b ok, he's the only one u need to convince, so address ur concerns to him. Everyone else is just everyone else.
i think you should BF no matter what your mother in laws says. bond with your little guy during feedings, she can bond by burping and rocking. your the mommy do what you think is best for your baby