What Causes Burning Sensation In My Vagina?

I m Divya,m 27 yrs old. got married two months back . these many days i did not have problem.now while intercourse i feel that my vaginal lips(one of them have swollen a bit) are getting rubbed(though lubrication is there) and internally i feel a burning sensation , a white discharge is there more than usual . is it an infection?

Thank You,
Divya