Thanks for the query.
High force water can sometimes affect the hymen
and there is possibility of breakage at some area.
Increased white discharge can be seen during normal menstrual cycle also.
But as you are having irritation etc., better to rule out the possibility of infection.
You stop masturbating for few days, possibly this will decrease the symptoms.
If not you can consult gynecologist and get examined to find out the actual cause of the problem, as vaginal infections can be seen in virgins also no need to hesitate in it.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429