And pray we will.
I want to start out by saying that you deal with what all of us deal with at some level or another. God has blessed you with that which is beautiful, a healthy sex drive. The devil, however, wishes to do what he does best and corrupt that which is beautiful.
Do not feel that you are alone, or outcasted from others. Many of the people you know well do it too. This doesn't make it right, but know that anyone can suffer from it.
Sexual temptation is one of the hardest ones to deal with. It's a touchy subject for most, but it's importance demands we not beat around the bush with it and confront it.
Don't allow yourself too much leisure time, especially alone. Stay busy and when you inevitably start to feel urges, remember that it is unpleasing to God and pray to him for strength.
The very fact that you're here and asking for advice shows your conviction, as well as the battle between good and evil raging on inside of you. Do not, under any circumstance, give up the fight. If you continue to resist the devil and truly wish to do good, God will recognize his own. This fight is not an easy one, good luck.