every time you feel a creative impulse or urge, do something about it, write it down, make the thing (or even just a shitty draft of the thing), then index it – connect it to your existing body of work. over time the body of work grows. congratulations, you're a creative person. Do this for a few years, and maybe read a few biographies of creative people, etc, and you start to develop a bird's eye view of yourself.
improv is all about exploring creativity