Sounds like you have nervous energy...lol. Im 27 and am the same way, I always have to be moving. My Boss jokes around that she gets "2 employees for the price of 1"
Why dont you get something to keep your hands busy - a stress ball, a pen (works great for me), a set of keys - anything. But I will say Im the same exact way. If Im not fiddling with something in my hands, then Im shaking my leg. If Im not shaking my leg, then Im tapping my foot... and so on. Its just the way I am and doesnt interfere with my day to day activities.