Struggling with pregnancy - birth transition

I feel very possessive and protective over my baby. I HATE when people hold her. I’m fine with my partner holding her but I HATE when other people hold her. I don’t know why. I just feel very protective and possessive over him. I am struggling with the fact that I carried him and protected him for 9 months and now I have to share him. I am 4 weeks PP. I don’t want to keep my baby away from other family members so I grit and bare it and I want to get better. I just wondered if this was a common feeling after birth. I particularly hate when my baby is held by people who had NO involvement in the pregnancy and didn’t care.