What Causes Vaginal Opening To Be White?

my vaginal opening is turning white its not itchy or burning i feels fine and there is no smelly discharge but it worries me becaue it is turning white i noticed when i started having sex it would bleed a little when it was still pink and swell and hurt a bit but would be fine the next day. i thought it was from being new to sex and the fact the guy i was with was a little big.