Aw I know what you mean sometimes it's just too hard. I'm feeling the same at the mo. FB doesn't help! Everyone I know is having a girl or if they don't know what they're having their 13 week scan pic screams girl nub BIG time so know it'll all be girls. Can't help but then think that all the girls will be taken and I won't get one.
It's ok to feel down Hun it's normal as it's feeling raw emotions and not even emotions you can show in public as people just don't get it!! But hey you might end up having a girl next, decide to have a sixth anyway and gave another girl! Anything is possible it could just be your turn for a little pink soon!