P.G.
How do you spend your time with your son? Do you make time for him and actively engage him or do you "wait" for him to pay attention to you? If your main interaction is criticism only, and you don't make time for the two of you or for all of you as a family to just be together, then perhaps that's part of it. Teaching him how to not do things/discipline is NOT criticism. If you are really criticising him and not just telling him "no biting" and redirecting, then that is a problem and you need to find a way to learn to discipline without criticism.
Your baby loves you. You have to know that and believe it. It takes YEARS of a parent abusing their children for the children to get close to not loving their parent.
If you believe that your child doesn't love you and you are angry or aggravated, he will pick up on your discomfort. Children are sensitive and if you are starting to resent your child for how he interacts with you and your husband differently, your son WILL feel that - which won't help him to be comfortable with you. So you really need to deal with your insecurity and not let it color your relationship with your child - talk to your primary care doctor to make sure this isn't post partum depression of some sort.