As far as weed goes, I was a hardcore stoner when I was your age. I was basically doing anything I could that didn't require a needle (or crack, wouldn't touch that.) I ended up dropping everything, including weed, for 15 years without batting an eye. It was the second best decision of my life, I got my head on straight and did some pretty cool shit. The first best decision I made, was starting smoking weed again at 33. Neck, back, and shoulder all quit hurting, migraines quit coming at the rate of 4 a week, and I started sleeping more than 3 hours a night. Now I smoke every day, all day. Only two or three hits for about 3 hours, don't ever really get high, but nothing ever hurts and stress kind of magically isn't. I too miss being blasted stoned, but it's 1) too expensive these days and 2) I have way too much to do to veg out with any regularity.
As to the boys thing. I'll just say this, "Sex is like a can of Pringles; once you pop, you can't stop!"