That is a good point. You'll want to make sure you get a bird that seems less likely to bond to one person only. Having an Amazon as a teenager can be pretty frustrating. Forget about sleeping in, it will scream in the morning to get you up. Also forget about doing your homework in peace - after you've been away at school all day, it will expect your attention and demand it loudly. You'll have to make sure you're home more often than your friends will understand. I got my Amazon when I was 13 and although I don't regret having her, I will say that it would have been better to wait. She was supposed to be a family bird, but she bonded to me. I had a pretty active life in high school - school, sports, a job, friends - and she really didn't get the attention she deserved back then. Sure, she was taken care of at home, but she drove my family crazy with her screaming. I often joke about her that she made me a teen mom, and it's really not that far off the mark, really. She is much more responsibility than a dog, but it's frustrating because people are not understanding of how big a responsibility she is for me. I can't just take off and go somewhere for a weekend or a week. I can't go out for drinks after classes on a Friday and stay out all night. Once I broke up with a guy because he wanted me to spend too much time at his house and I felt bad leaving her alone at home. There's also the issue of puberty - having a baby might be fine, but once your bird starts going through puberty it will be another matter. When mine did, she started attacking my mother. This will happen with your bird when you are in college or finishing up high school, probably dealing with a lot of stress and living with roommates. Are you sure you want to miss out on the social opportunities of college so you can stay at home with your pubescent parrot?
So anyways, take into consideration how well a bird responds to different people, as well as the hormonal issues attached to different species and sexes. Given my own experience, I don't think it would be fair for me to tell you not to get a bird, but just remember that it's a big decision, and there isn't a hurry. Go meet these babies, but keep in mind that you can always get one at another time if you don't find a perfect match or you start to feel like you might not be ready yet. You don't want to be stuck with the wrong bird for the rest of your life!