Don't worry my friend, if you get an erection, then your pre-cum is absolutely ok. 99% guys get it, it's just a normal relaction, your body changes with age, and that is what happens. If I were you, I would cut down on the masturbation to 2 days a week, believe me, it feels better and doesn't run down your body that much. Basically, it is safer. Oh, and if you feel that you have too much energy, and need to release it, go outside and play b-ball, soccer, or whatever other sport you like, it will be to your benefit!
Figar007