I dunno, we had read that in families where there are children of both sex, if the girl is born first she is more confident in herself and her abilities, so we were hoping for a girl first. So maybe being the oldest and a girl was in some way a blessing for you.
I think being the oldest is a burden regardless of whether your younger siblings are sisters or brothers anyway... I have 2 little sisters and Eric has 2 little brothers and we feel about the same about them.