There is no need to count calories.
The good news is, you're within the ideal weight range for your height.
So, starting a cardio program, beginning a strength training program, and swapping cleaner foods for junk foods is all you need to do.
I don't think you should follow a traditional "cutting" diet, because you're not overweight. I think if you do end up counting calories, you should try to eat very close to your Total Daily Energy Expenditure. You might end up having to ADD some foods to your diet (usually the best bets if that's the case are nuts and fish), because cleaner foods will likely fill you up more and could put you at too great of a caloric deficit for your increased activity levels.