I had a alcohol blackout a few days ago and my friend told me that I fell on my back a lot since that day I have a lot of watery discharge im 18 virgin?

Get examined. Have your physician do a complete exam including vaginal cultures and possibly a pap smear.
Balance off? If you fell on your head with the blackout and have been falling a lot since, make sure you get a full neurological exam too. Subdural hematomas (bleed around the brain) can show up that way, also if mental status goes in and out, get "goofy".