I've recently lost my virginity and started having sex, whenever i do it in the missionary position i bleed. any other position is ok. why do i bleed?

Bleeding=injury: If you bled after every intercourse it could be that you are finishing up tearing the hymen that sits at the entrance of your vagina. Bright blood will always mean some tissue is scratched or torn.If it is a small trickle & stops, it should eventually stop. If it continues after every encounter you are scratching or injuring something and it is worth a visit to see why.