gregbeast is right. i got into lifting at 14, 8th grade. I was maybe just over 100lbs, i didn't like eatting, i skipped breakfest, ate very little lunch and ate very little dinner. Nothing came of the lifting. Then i got some common sense knocked into me and i'm 150lbs and gaining and still the same height i was when i was in 8th grade and i'm now in 11th, just a whole lot bulkier. You don't need supps, they aren't a big deal. Yes, they help, but you can still gain without them, just eat like theres no tomorrow. I do, no size gains yet, but my strength is goin through the roof.
But as long as you eat clean and get enough, your fine without supps and you will still gain. Eat 6 meals a day, but at the 3 main ones, eat till you can not eat no more cause your metabolism really does fight against you and it sucks. It just teaches you the meaning of hardwork though.
Whats the reason you can't take supps though? Is it cause of your parents?