If you are really only 15 years old, ask yourself where you will be in 15 more years. College, girls, friends, moves and jobs are not typically reticulated python friendly at least retics that go 9+ feet.
I agree they are an exciting snake, but they require FULL, stable commitment and should not be purchased on impulse.
I just said this in another post, but I will say it again.
One of the biggest problems in the hobby is when people, usually young, unestablished folks buy an animal that they don't plan far enough into the future for.
Larger snakes are the hardest to place when the owner can't care for them any longer. They are also the first red light you'll hit when trying to rent a room or apartment.
Going from a small, timid, docile royal to a fast growing, highly active retic is a very big jump.
If you are looking to step up, find a different boa breeder as there are a ton out there and get a nice, common male boa constrictor.
If you have it all figured out, great, but if not, stay smaller and get settled into life first and then look at getting a retic if you still have the urge.