I am trying to simplify my life, and I need suggestions?

I am a senior in high school and I want to try to simplify my life and find something real before i go to college. I do not play any sports any more, have no real hobbies, and i feel like i am not unique at all. I feel like everything i do is just a waste of time and i have nothing to show for it. I want to change this. I want to sell all my video games for a start, because i feel this is my biggest waste of time, i have a guitar and i want to start playing every day, as well as working out more. what else should i do to make my time worthwile instead of just wasting it? thanks for any suggestions, DK