Baby girl blues...

Yesterday, I went to the doctors office and found out the sex of my baby. When I found out she was a girl I cried so hard I nearly got sick. I was praying for a boy as I had previously miscarried twin boys. I know that no child will be able to replace the two I lost, but I was hoping to have a boy to ease the pain as people typically say "boys love their mama" and refer to girls as daddy's. I'm struggling with guilt for being sad at the gender of my baby even though she is healthy and active. Has anyone else felt like this? Is this an indication that I won't be a good mother? Will I be able to accept her when she gets here?