Sounds like you have a healthy ambition, which is uncommon, especially for a teenager.
You have two options: find the job, or create the job yourself.
In order to find this job, you need to first find someone who is open-minded enough to let you learn by doing on the job. They would likely expect to see projects that you have done to decide if you can do what you say you can. It can be relatively hard to find someone at an established company to give you such an opportunity without a university education. Most people follow an established route - they are not trailblazers. Therefore your challenge would be to convince someone to see things the way you do.
If you have a vision of how things ought to be, you need to avoid the first option. This will help you learn/grow fast. Otherwise you would be wasting lots of precious time and be held back from the expectations of others.
The second option is to create your own job. You can either start your company, or join an early stage company. Either case would still require you do be able to demonstration that you are capable of taking action. Your chances of getting this opportunity is much higher in the startup world.
There are pros and cons to both options. You just have to decide what you value most: learning or comfort.
Embrace making mistakes. Learn as much from others as possible, but know that the fastest way to learn is to do, and to do, you will make mistakes. Mistakes are the requisite to experience. It is a healthy and unavoidable part of life. The journey is yours alone and no one can do it for you.