Most of the people that do this for a living have been in the hobby for 10+ years working their way up to that level. Its not like any other business where you can just take out a loan and jump in and expect to turn a profit right away.

You're very young, I would recommend keeping your collection small. Especially if you have plans to go away to college. If your heart is truly set on reptiles take care of your education first and the passion will always be there to pick up on again in the future.

With animals that live 30+ years its a lifelong commitment to make.