Gender letdown...opinions?

Found out that we're expecting a girl. Problem is I was wanting a boy. Badly. I cried when we found out and was hoping she just made a mistake. I've been a little bitter all day and don't want to tell people that she is a girl yet. Don't get me wrong, I am blessed to have this baby and will love her all the same, I'm just wondering if any other mama's are/were disappointed? It's like I spent 20 weeks imagining this perfect boy and is hard to let that go and start dreaming of my princess. How long did it take you to get excited if you were let down? I don't want this feeling to last the rest of my pregnancy like some websites say. Just making sure I'm not the only one!