You're 17 so I'm going to share this wisdom with you
Stay in school, but keep trying for ATC if you want to.
Here's the reasons why:
1. The process for ATC is VERY HARD, and that's just to get IN to the course. There are about 20000 applicants per year and only about 40 get chosen across the country per specialization, and that's IF they run courses.
2. When you are young, you have the luxury of believing that you may not be interested in the particular field you're training in. When you're older, you usually kiss the sky thanking Heaven that you stuck with whatever it was you were studying. What I'm trying to say is that you're already involved in the Aviation Industry, which is pretty cool. Giving up a career that gets you as close to the planes as you get, to do something that's about equal, makes no sense. Especially since you're doing something that is a critical part of getting and keeping the planes off the ground. It sounds pretty stellar, if you ask me. This is especially so since you can attend School and come out with a Degree or Certificate that qualifies you for employment, which is probably in demand, and if it isn't, has direct applications in other mechanical areas which will keep food on your plate. Becoming an ATC has nothing to do with school in the strict sense of the word.
3. No matter WHAT you do, eventually it becomes work. Sitting in a Tower may seem cool at first, but eventually, even that becomes work (fun work, but work nevertheless), so thinking that it will be \"rock star\" all the time isn't reality. Even rock stars get used to their jobs after a while.
4. If you still want to go for ATC, do it. Just finish your Schooling and get your certifications first (even if you make it past the initial ATC tests, it could be a year or two before you get picked for a course (if you actually do, and the odds aren't that good (.002% of all applicants make it onto course using the numbers above (40 students/20000 applicants = .002%/year) and even if the number was triple that made it, it would still be seriously crappy odds), so \"don't give up your day job just yet\" (as the saying goes). Go and make sure you're employable and since you're young, you've got time to do it AND go for a spot on ATC. That way, no matter what, you'll still be close to the planes you love to be around.
I'm not trying to discourage you, just giving you some things to think about.
Regardless, I wish you well.