One of the biggest things that I've learned through my self-education is that of personal responsibility.
Unfortunately, I think a lot of people fail to succeed in life because of not taking responsibility for one's actions. When you don't think you are the one in control of your life, you leave it up to chance. I love the metaphor of a ship going through the ocean; if we are not the ones at the helm, the ship may drift.
As a teenager, I know that I am not in complete control of my life as I still live under my parent's roof. But that does not stop me from being pro-active and taking steps to be responsible for the good and bad things in my life. You may not be able to work or provide a living for the rest of the household, so you have to rely on them for your wellbeing. Take a step forward, take full responsibility for the things you do have control of, and realize that you are the captain of your ship, not those around you.
Key takeaways:
1) People fail because they don't take personal responsibility
2) If you don't take the helm, your ship will drift
3) Even in situations where you don't have complete control, you are still the captain.