Dont worry about it, the more you worry the more it will happen. Just be happy and horny. By the way, jerking off every 5 days will cause no wet dreams, and perhaps no morning wood.
Sometimes I get it, sometimes I dont. Im always horny in the morning, especially if I sleep long, and touching it, or rubbing against sheets, or against woman will make it stand up. Try turning over and against the materess when you wake up, youll get it.
Now, I was an idiot and jerked off when I was your age. It messes up everything, starting with your hormones, and this is a critical age for you when you are still developing. Then there is emotional. I suggest you go on to 6 month plan. Im 26 and Im trying that.