Down Boy!!!!! I think you may have a case of wanting something too soon! Remember that the guy you have pictured is probably in his early 20's I'm guessing! He didn't just wake up one day and have his body and stregth numbers! Your 14! Get in the weight room and lift to get stronger.
Another point.....BECOME A GOOD FOOTBALL PLAYER! If that's waht you want, then you need to work on things ON THE FIELD! I think many people have this idea that if they get strong they will be better at whatever sport they are in....epecially younger people! I was one of those people. Took a good slap in the head to realize it. I was not a quick gainer in H.S...so I needed to rely on getting better on the field and in the ring (I was a shot putter and discus thrower). I went to college, still small, but had good fundimental skills (got a scholarship in track). I eventually got stronger and bigger, but it only helped me in the long run, because I already had learned the right way to throw. Just advise, that's it.
I'm not trying to discourage you AT ALL to hit the wieghts, because yes they will help! Just saying that if you want to be like that guy, be a good football player first. A coach said to me once.....your a thrower who happens to be stonger than the average individual. Your a thrower first....you train as a thrower on the track team...not the weight lifting team! Your still young. You have a lot of years ahead of you, and if you work your AZZ off, things WILL come together!