How can i become a martial arts master?

i've wanted this for a really long time.a couple of years ago i started taking karate lessons, but the sensei wasn't teaching us "real karate". my mom made me quit because she said that i didn't have enough time for it. i really want to become stronger and i'm interested in learning, muay thai, caopeira, or kickboxing. is there somewhere where i can meet a martial arts master? how do i become one? by the way i'm only 13 (almost 14)