And if you decide to go to college? Where would you house these large lizards, because I'm certain your dorm/apartment won't allow it. Are your parents willing to take care of it for 4 years? Even if you don't go to school, you're gonna want to move out at some point and I happen to know (from recent experience) that many landlords won't allow exotic species... so that really limits your possibilities for renting and I'd wager you won't be buying a house straight off.
Are you really ready to commit to something that has an average lifespan that is longer than you've been around at this point?
I hate to be a downer... but unless your parents are also big into herps, I don't think it is a good idea until you're out on your own.