Acting is hard work. It's not just hard to act, but it's also hard to find acting gigs. If you're sixteen you'll need a great deal of parental support. They'll need to take you to lessons, auditions, look out for your best interests in the business world.
But if you plan on going it alone, you've got a couple of options. Get a night job that will let you go to lessons which are usually at night too, so that you can make yourself available for auditions that you'll be made aware of 15 minutes after you were supposed to be there.
Or you can move to LA and be a bum. Sleep on the streets and just go to auditions.
In either way, it'll probably be a few years before you can get gigs regularly.