Yes! I ran a silk-screen printing business when I was 15. It was a great learning experience.

Do you ever watch Shark Tank? This episode has all kid/teen entrepreneurs:
http://www.huffingtonpost.com/2014/03/12/shark-tank-kids-episode_n_4950983.html

Here's a Ted talk check out:
https://www.ted.com/talks/maya_penn_meet_a_young_entrepreneur_cartoonist_designer_activist

Remember, most adult entrepreneurs have no idea what they are doing! We try things, see what sticks, and learn from our mistakes.