Being creative doesn't always mean quitting your day job and doing something that involves paint brushes.
Being creative doesn't always mean you have to use the words "creative" and "professional" in the same sentence when describing what you to do for work to people.
Being creative doesn't always mean you have to play an instrument like the guitar or the cello.
What being creative always means, though, is that you are the kind of person who looks for unique ways to affect change, influence people, and solve problems in the context that you are in right now.
Yes, I said right now.
You might respond, "But I do this for a living!"
Or, "But I live here!"
Or, "But such and such circumstances prevents me from being creative!"
Or any other excuse that allows you to escape your creative potential and responsibility.
To which I'd respond to any and all of those excuses: each of these realities don't prevent creativity; they create opportunities for it.
So get out there and do something. Be creative. And if you aren't, chances are your definition of being creative needs some reassessment.