As a martial artist who has been training in traditional Tang Soo Do Moo Duk Kwan since age 5 (I'm now 21), I would suggest avoiding steriods.
Martial arts teaches you to respect your body, and steriods is a means of destroying your body in the long-run. Sure, if you are a competitor it may give you a physical edge as a young and healthy athlete, but the long-term repercusions of using gear outweight its usefulness.
Remember, martial arts is 80% mental, and 20% physical. If you focus more on staying in control in a match, and learning to read your opponent, you will win more than you ever will with some added steriods.
On a side note, although Bruce Lee did a lot to bring martial arts into the public eye, he is by far not the ideal representative of the martial arts. In fact, he essentially betrayed his master, Yip Man, by leaving him and starting his own martial art. Honor is very important in the martial arts, and you should always respect those that have taught you and carry on their legacy. That doesn't mean you have to be stagnant in your growth in the martial arts, but it means you should continue to train under your original master as long as you can. In fact, Bruce Lee left Yip Man relatively early in his training.
He was also concerned with fame more than personal growth. The true martial artist seeks only personal growth, but I've yet to find someone (aside from monks) that has been able to achieve this. Still, I've met many masters that are better role models than Bruce Lee ever was.