On the one hand, I'd love to have a girl because girls are so much fun! But on the other, I know baby girls are adored by their daddies and I have this irrational fear that my DH will ignore and not adore me as much if our baby is a daughter! I know it's crazy, and I know I'll probably be fine if/when the time comes, but I feel like a horrible person so I'm wondering if this is something other women think about as well.

There are a few ways to fix this. If your daughter is the best at everything, you won't have to feel jealous of any other mothers. Make sure she's always top of the class - homework must come before sleep. If any of her friends start ballet or piano, make her practice twice as hard as they do. If she starts riding, make sure her pony is twice as expensive as theirs. Enter her in beauty pageants whenever you can. Get her used to hair salons and mani/pedicures while she's still young. Don't ever let her eat meat, ice cream or chocolate - if she's never tempted by food, she'll never need to diet.
Remember everything you wanted to achieve in life but never did? It's up to your daughter now. Good luck.