Self-defense isn't the primary reason for joining TKD as a child for most people. But I joined because I was dragged to it by my teenage daughter.
Why did you join TKD-PNoy? We all found something that we liked. The structure, discipline, hard physical regimen, the fact that it is 90% kicking with alot of diversity and for some organizations includes upperbody strikes like punching, uppercuts, hooks etc. The breaking is fun and a way to learn about oneself. I like learning form, poomse, as a self-exploratory ladder of steps into the depth of TKD. We train upper body, abs, legs, speed, strength, flexibility, balance, agility. Why are we so strong? We do thousands of kicks each class. Our emphasis is on the physical.
Our self-defense is adequate. It is for self-defense-not looking for a fight. My interest doesn't lie there so much but still would like to know more and as a black belt am getting into more complex technique. TKD is not just about self-defense. But for those who strive for more, go deeper into the art, very much can defend themselves. I see TKD as a way of life, literally, to keep active, flexible, strong in mind and body. TW