Andrew,
I am 63 years old so when I was in High School the draft was VERY MUCH in force. I was not ready for college out of high school, so the draft was breathing down my neck when I was 19. Long story short, I ended up at a Navy Recruiters office who asked me if I wanted to fly. It turned out that I didn't have the eyesight necessary and ended up as a Missile and Radar Repairman in the Army.
In that day and time, had I been able to fly in the military my future might have been much different. I've had a great life, but I often wonder what it would have been like had I been able to learn to fly in the military at that young age.
Today, there are not as many opportunities to fly for a living as there were in the past, but this doesn't mean that you can't build a career around aviation.
The Air National Guard might be the greatest thing that could ever happen to you and it doesn't cost anything to go check it out. I can almost guarantee that if you go talk to them, they will treat you like an adult and tell you what it would take to do this.
You just never know how something like that might turn out. You might end up flying or learning avionics, or learning something else about aviation. In the course of that, the military, even the National Guard can teach you things that will speed your career along just due to your gaining good work habits and carrying lots of responsibility. When I was 21 years old in the Army, I was responsible for millions of dollars worth of radar and fire control equipment. You would rarely if ever carry such responsibility in civilian life. This is career enhancing experience.
When I was your age I didn't have the foresight to check into such things. If it weren't for the draft leading me to a really good electronics school in the Army instead of being drafted, I would probably have never developed a love for electronics. After the Army I went to school and learned MUCH more about electronics that led to a good career.
Andrew, the guys on this site mean well and there are TONS of aviation experience here. Learn from them, but don't EVER let ANYONE pour cold water on your dreams. If you think you would enjoy being around aviation, then check it out, learn about it. Aviation is not the only industry that is suffering and changing. Planes are here to stay. SOMEONE has to fly them, build them and take care of them.
Be positive, be aggressive and keep asking questions.
My Grandfather told me when I was about your age, that if I could find a job that I loved I would never have to work again the rest of my life. it was good advice. Ask questions and don't be happy with one answer from one person. Talk to LOTS of people so that you hear the good AND the bad.
Very best of luck and keep asking those questions!