Hi HaRdStYlEr,
I also started smoking at 13; I am 29 now and am currently quitting. I say currently because it has been two months, but I fall back once and awhile when I am out with friends. I am quitting because I FEEL IT, and it sucks! You are right, quit before you feel it! The advice given above my post was all great

Two pieces of advice to add:
First, I had tried to quit many times and e-cigarettes are what helped me finally quit. I personally recommend blu cigs, also they are always listed in the top 5 best e-cigs on review sites, they are VERY affordable.
Second, know the places you always are and the people you are always with when you feel the need to smoke. In the car, right after school, with a certain friend. That is when you have to be very vigilant. The e-cigs help in the car a lot, also don't be afraid to ask friends and family to refrain from smoking around you, though parents can be tough.
I hope that helps

Good Luck!