Hello TL and welcome,
While I appreciate your enthusiasm, “it’s hard being young and trying to achieve your goals” because frankly you are VERY young. That’s not meant to insult or offend, it’s just a fact. But let’s see if we can’t get you pointed in the right direction.
First the AOPA is an excellent organization and a strong advocate for general aviation but you can’t “earn your Private Pilot license from AOPA.org”. You need to find a flight school. While you can’t earn your Private till your 17 you can start training and building time. The other thing to consider is you can’t get your ATP License (and therefore fly for an airline) until you’re 21 so starting at ATP at 18 and instructing to build your time to the 1500hr requirement you’d find yourself shy a year and be hanging and waiting. You also need to consider your education. While the Regionals will hire you without a degree many Majors will not and at your age the last thing you want to do is limit your opportunities.
With all that in mind I believe a much more solid plan would be for you to earn you Private, fly when you can to build some time, THEN got to college and earn you degree. After you graduate finish your training at ATP and instruct until you build your 1500 hrs. Again the reason you’re so limited is the fact you’re so young. While I have no doubt you have the desire there’s much more that goes along with a career in aviation then just desire. It takes judgment and maturity which will come in time.
That all said have you ever flown a small plane? If the answer is no then you’re really getting WAYYYYY ahead of yourself. It doesn’t matter how much you believe this is what you want to do for the rest of your life if you haven’t ever flown you don’t honestly don’t know. Before you start wondering, worrying and attempting to reach your goal you need to make sure it’s what you really want to do. Go fly and then we can talk.