privates itchy swollen burning smells funny

I'm a virgin But I masturbate occasionally. When I was on my period I went biking and then next morning my vagina was very itchy I itched it and itched it a lot. Then a day later it was a combination of irritation inflammation swelling itching and burning. The third day I noticed that it smelled weird an unusual funny smell. I kept itching it really hard and moments later I felt it moist down there. So I checked it and the outside of the vagina was wet a bit moist but the inside was not. Is this an infection? could it have been because I scratched my vagina too much? Probably the bike ride while i was on my period ? I have no idea someone help please !