Hello and welcome Daegus:
Please be assured of my prayers.
You have the right attitude: a prayerful attitude.
I will pray especially that you be not ensnared in impurity.
Here's something I posted sometime ago:
http://www.cathinfo.com/catholic.php/Prayers-for-PurityIt was helpful for me because I was able to memorize the indulgenced prayers and was able to pray them in time of sudden and violent temptation.
Just remember that the urge to sin passes with the moment if you distract yourself with something wholesome (like prayer, or reading good books, or algebra, or fractions, etc.). The bodies that are the objects of lust now will be food for worms soon, and the beauty that tempts us will become disfigured even in life with the passage of time.
Other than prayer and spiritual reading, thinking of mathematical equations and the reality of death and bodily decomposition help me when I'm headed for trouble in this regard.