It's not easy
You will need to branch out to other forms of advantage play besides blackjack. There are few professional players nowadays who just count cards at blackjack. Most have other skills they put to use in casinos. Casinos contain other advantage situations, none of which will be discussed publicly on a message board, because they are too fragile. Remember that casino personnel read these boards, too. Educating one's opponents is not a good idea.
You stated that you are very young. Youthful appearance can work against you if you frequently get hassled for ID to prove you're of legal age. Also, if you look as young as you are, betting reasonable amounts of money will look unusual to pit personnel, again inviting unwanted scrutiny.
I wouldn't recommend playing full time until you have some casino experience. You may find you don't like it, or can't deal with the constant hassles from casino personnel.
My suggestion is to continue your education, and see if other life opportunities interest you. Build a bankroll through normal employment, and learn about casino advantage play part-time. Once you've played part-time for at least a year and have amassed a five-figure bankroll as a bare-bones minimum, you can start thinking about playing full time. With a small bankroll, you will need to grind coupons, exploit promotions, drawings, tournaments, etc., milk low-level comps (that's all the comps you'll get), put in a lot of hours, and keep your personal living expenses at an absolute minimum. When grinding at low levels, you must be careful not to let expenses eat you up. You cannot afford valet parking. You cannot afford to tip. Save, save, save; scrounge, scrounge, and scrounge. Pick up and use coupons others have thrown on the floor. Do not pass up anything of value, regardless of how small it is. Get your friends and neighbors to hand over whatever casino mail offers they won't use.
If I had it to do over again, I would not have considered playing full-time until my bankroll reached at least $50,000, which is still small compared to the bankrolls of most full-time players. Though I am well past that level now, when I started full-time play, my bankroll was a fraction of its current level. And I have the benefit of having a spouse with a good income. Without that second income, solo advantage play on a tiny bankroll is tough. If you want to do it bad enough, it can be done. But it is not easy, and it is even harder if you plan to use only blackjack card counting as your game. Plenty of blackjack opportunities still exist, but they are getting harder and harder to find, especially at low stakes.
I hope this helps. Actually, I hope I've talked you out of it. Good luck whatever you decide.