Gender disappointment

Okay ladies I am posting this anonymously because I feel like an awful person. We found out today that we are having a girl, and I am disappointed. Everything in my mind and in my heart said it was a boy, I have only ever imagined having a boy. I was so sure that it was a boy, part of me thinks that the doctor is wrong. Obviously I'm over the moon thrilled that we are pregnant it took us a long time and we had help. Thats what makes me feel even worse that I could be so selfish after trying so hard for a baby that I am disappointed that its a girl. I have read a lot on gender disappointment and I know that its fairly common and doesnt make me a bad person, but it sure does make me feel like the worst person ever. Our baby is healthy and that is the most important thing. But I know that if the Doctor had said that it was a boy I would of immediately called everyone I know, but now my husband and I are just trying to wrap our minds around having a girl before we tell anyone. I know I am a bad person and selfish and I hate that I have this feeling. I am not mad at my unborn daughter obviously, I think I am in shock.