You'll need several thousand dollars in store in order to buy an Amazon, buy a huge cage, the necessary toys, food and things they need to be happy birds. At thirteen you simply cannot provide the kind of lifestyle an Amazon needs. They are incredibly intelligent birds that are not like dogs or cats, they want to be respected and will let you know when you do something wrong to upset them. They can be very moody and can be hard to train without the right experience.
Please wait another ten years after your life has become more stable -- these guys live a long time, 40 + years, and you will need to provide daily interaction, food preparation and monthly toys. That's not including vet visits to make sure amazon is healthy.
I highly recommend you keep researching and find a local bird rescue in your area to volunteer at, would be an excellent idea at your age to get some experience. There, you will be able to get to know the Amazon species (should the rescue you go to have some) as well as different species big and small. They are a huge responsibility but volunteering takes away that responsibility but gives you the experience to understand their body language, the sounds they make, the way they interact with each other and you.