12 weeks, its a boy

I'm a horrible person for feeling like this. I'm having a boy and Im so unhappy. I have a boy and I wanted him to be my only boy. I don't feel a connection to this baby and after the ultrasound I cried. I have no reason to go out and get the baby a boy outfit to try and get used to the idea because my son is only 8 months and this baby will fit into almost everything that is his. Boy names are so hard and I had to stop looking. Every name I see I dont like. I'm fully aware I sound like a horrible mom and I am not saying I'm not grateful and I do love the baby, but I'm just not excited anymore.