I wouldn't recommend it. I know a lot of guys say you're young go for it -but from my experience, you're young and the clock's ticking.
If I were you, I would check out the Dept of Labor and Stats website, find a high paying IN-DEMAND job that you enjoy and go for it! Then, once that happens, you'll probably want to buy a house, a nice car, settle down, get married, have kids, etc. Basically LIVING life. Then you can use knifemaking as a hobby, buy whatever you need -and if it takes off great! If not, you're still gonna be alright.
Otherwise, trying to be a knifemaker now, without a career -is in my opinion kinda foolish, as if you fail -you're screwed AND out of the most precious thing in life and that's TIME.
Enjoy your youth, but be prepared -30 creeps up pretty fast from 19, then 40, then 50, if you don't have your sh*t sorted out by the time you're 40 -it's gonna suck. I've seen people who enjoyed their youth, partying, smoking pot, screwing around, and now they don't have anything -divorced and living in a trailer, unemployed/ working part time as a laborer, etc. with barely enough money for food. Money is the root of all problems (most domestic disputes are over money) and although it is evil, it is a necessary evil due to our capitalistic society (which is great for the rich, but really sucks for the poor).
There's nothing wrong with dreaming, but in today's world, you have to be realistic. Houses ain't cheap anymore, businesses are going overseas, money isn't plentiful (I have a feeling in the next few decades, fewer people are going to be rich, but the rich are going to be filthy rich, and more people are going to be middle class or poor) if I were you I'd look into a "Service" field (eg. Something in the Medical field: Doctor, Nurse, Dentist or Cop, Fireman, etc.) as you can't outsource these jobs. Easy to find a job, good job security, good pay, good benefits -and I know where I am, they only work 3 days a week -and can make $60K a year. Leaves plenty of time for knifemaking and supplies, and really helps if your wife makes just as much.
Be smart kid, it's all about sh*t happens, be prepared, be educated and the world is your's.
P.S> Don't marry a crazy b*tch, cuz she'll just screw up your plans. Make a plan and stick to it. Remember it's all about you and your dream. Make it a reality.