What kind of martial arts suits me?

Again. Im very tall for my age taller then most of my teachers. im 13. My birthday today! but im not very strong or fast ( unless you count my long legs which take twice a step of a shorter person) . my cl mates are very annoying they make me snap twice a week which is definitely a record. my Friends shouldn't be able to make me snap since they can i want a martial arts that could make them stop. i don't know words won't help since i tried it already. Like some kind of look or give them a negative feeling when they do it instead of the positive feeling they get when they annoy me don't get me wrong i don't want to hurt them i just want them to stop annoying me its not like i will hurt them. i want to learn the samurai sword and the nunchuku. i think tai chi might suit me since it basically takes your spiritual feelings and takes it to your advantage (of course its only use full in a fist fight). now if you think tai chi won't suit me then please just say so. I know not to hurt someone unless he comes in contact with me first and not hurt anyone badly. i won't hurt my Friends badly if there about to make me snap i just want to give them a feeling that they should stop annoying me. so please no stupid answers and get what i'm saying.