I just recently graduated a year early from high school and since I just decided not to enlist into the U.S. military service (Personal Reasons). I have absolutely no idea what career or job that I want to do.

After some searches I did around, I learned that Japan only takes those who can benefit the country. Along with at least a Bachelor degree, a sponsor from Japan to obtain a work VISA, and somewhere on the line...10 years work experience? That being said, seeing the Work VISA list on the Ministry of Foreign Affairs of Japan website. Beside teaching english, I was wondering what is the most needed job that can benefit Japan? Engineer, Military, street vendor (I'll do Any); The white and blue collar type of jobs. I'm already planning to take Japanese language classes to hopefully be more close to fluent. And planning to get a Bachelor Degree (Or not) on whatever the job is.

Any help would be great and if I'm wrong, educating me would be nice as well. To be honest, I'm pretty bit desperate and paranoid. Since I had never put any thoughts on a backup plan for another career. Thanks! :3

The 10 years work experience bit is not necessary usually.
A good plan is to get a degree in your country for some job you want to do there.. and then come to Japan.
That way, when you leave Japan you can follow your preferred career in your country.
Besides, what jobs are available now may be different from what jobs are available then.