Squats. A billion squatz. Front squats, back squats, overhead squats, single leg squatz, all the squatz, do squats and you will become a Super Saiyan with giant legs. On a serious note, besides squats, do push presses, snatches and clean and jerks. But also, almost more importantly, practice box jumps, ie, find something you can jump on top of, either running start or standstill, and jump on it, and jump on progressively higher things.
If you got the balls for it, do a "girly" sport, I figure skate and it's kickass for building balance and power, without balance comes no power. You're young and skinny enough you could do gymnastics, not that you'd probably get at a high level, but still. Also, dance, especially ballet, awesome for gaining balance and control over your body. As you probably know, it's often recommended for football players to crosstrain in ballet, because it builds balance and power. But even after like 6 months of ice skating, I could parallel squat at least 225 my first time squatting ever, and deadlift 255 first time deadlifting ever. I've heard of 130lb gymnasts that were your age with some years of gymnastics deadlifting 400, the power you gain with such sports is remarkable. But you gotta swallow your pride and do the "girly" sports.