What martial arts style should i join?

I'd say mma as it's every aspect of fighting, find a good MMA gym and just put the style into sort of fractions of how you will spend your time maybe morning boxing, afternoon wrestling or do it by weeks boxing,strength and conditioning one week and karate,wrestling and jui jitsu the next week and do it like that just make a schedule and make sure to fully apply yourself in the classes it's best this way you don't want to spend all your time in just one aspect of the sport otherwise you will become one dimensional just divide your time with what you wanna do :), hope this helped.

Why a new style? Why not continue with Karate or Tang soo do? If you can't stick out anything what makes you think you will stick out the next one you join? So on that line it won't really matter what you join, since you won't be there long enough to make it matter. Not trying to be mean but you need to give some serious consideration to what you are doing and where it is going to get you. So you got a few beginner Karate techniques and a few beginner Tang Soo Do techniques. Wouldn't it be cooler if you had intermediate Karate techniques or intermediate Tang Soo Do techniques? You can have 5 years of training and still are stuck with beginner techniques in 5 different styles rather than advanced techniques in one style. It is not the quantity that makes you good but the quality of what you know. If you spread yourself too thin you will become a 'Jack of all trades and master of none'. There is a Japanese saying: "If you chase two rabbits you are likely to end up with none."

Try Baguazhan, Muay Boran, Daito-ryu Aikijutsu, Bokator, Mukna, Tarung Derajat, Sib Pal Gi, or Võ thuật Bình Định.

Considering there are thousands of martial arts pick one ad become dedicated to it. We don;t know what is available in your area. It might be available but the instructor might not be well qualified to teach it so they won't help you either.

Do choose a style. Choose a good instructor!

Wing Chun or Boxing Or Muay thai These 3 are worth it

Juijitsu,nimpo.Or if you want to stick with karate ( China hand )then I would suggest Kempo karate . As another post suggests your still young i would stick with your karate for now.

u should of stick with karate....judo and jui jitsu is great for beutiful grapple and throwing techniques, definitely not mma. Taekwondo is similar to karate.

Muay thai. Badass

Kajukenbo is good.