A bit of a personal question I guess but how far into puberty are you? Hormone levels can change dramatically and that could be a huge factor. I was an active kit and teen doing a lot of play and sports.
I didn't start lifting until Uni. Didn't have the lifting knowledge I have now but I was following a progressive program. I was getting stronger but not seeing size gains. Just before Christmas that year I hit an emotional and physical wall and left the gym for the holidays. I came back in January 20lbs heavier, a lot stronger and with a new drive. You will get there.
Eating primal is not a diet, it is a way of life.
Don't forget to play!