What Martial Arts should i use to start MMA?

I am 15, 5"10, and 210lbs. I love mma, and want to begin, but i dont know where to start. I have been playing american football, as a defensive tackle/noseguard, but its not mypion anymore. Ive done some street fighting, but thats pretty much just brawling. What should i start doing in order to begin my path to mma? i would like something aggressive, but my parents arent letting me do Muay Thai kickboxing or brazillian jiu jitsu, are there any other martial arts i could do that would help with MMA? if so, what kind?