I am about 15 Should I start doing penis enlargement exercises?

No !

those enlargement exercises do not work or those pills or those fake ads and commercials they do not work

im actually average size and we all wanted something bigger than what we have but what i found out you can take vitamins and herbs that will make it bigger before and during sex then afterwards it goes back to being small for example before you have sex with your girl take either one of these zinc,vitamin d,calcium ,caltrate ,or Pygeum

and while your getting in hte mood youll get real harder as it will pump more blood and youll be bigger and wider and your girl will notice this too after you reach climax it goes back to being normal hope this helps.

you can get these at any vitamin store online