I'm very "competitive" at the things that are most meaningful to me. For fleeting moments, lifting weights can seem more meaningful than other the things I do, but the novelty expires rather suddenly. I'm still not too sure with whom or what I am competing, though. There is an innate (physiological) streak of agression that drives men and we use this to create our masculinity. There my also be underlying feelings of inadequacy or some injustice that we feel compelled to remedy.
Do you fully understand the basis of your need to compete? These are answers that you should seek before you get much older. Before your lifting loses its meaning.
We who seek to build and strengthen our bodies are all "bodybuilders" some are bodybuilders in the strict sense (sensuo stricto) others in the general sense (sensuo lato). A javelin thrower who lifts weights to improve his performance is a bodybuilder sensuo lato. Even a calisthenics weed is a bodybuilder.