Am I wrong??

Hey all. I'm currently 15 weeks pregnant with baby #2. My first born is 10, I am currently 29. This pregnancy has been completely different from what I remember with my first child. My first born is a boy. When I was pregnant with him, I wanted a girl, and at the ultrasound when we were told it was a boy, I cried and had a little gender disappointment that went away after a few days. Well now here I am pregnant with number two, and I desperately want a baby girl. A lot of people say girl, but that's because they know what I want. The old wives tales are all over the place and of course are just for fun. I'm not sure of what the baby is, I didn't know with my son either, and each pregnancy is different so I can't just attribute it to the baby being a girl. But am I wrong for desperately wanting a girl to the point where I am trying to put in my head that it's a boy so I won't feel gender disappointment? I believe this will be my last baby so when I go to the stores I longingly stare at the girls clothes, while trying to think of how cute boys clothes could be. Ugh, I don't know. I'm so scared....