The world is big, huge, and interesting. Don't think its as small as the adults want you to think it is. Don't even think its as small as your friends of the same age say it is. They are are just repeating other 'cooler' adults are saying. 'Cooler' adults are still adults. Chances are they too will end up being just like the adults who are lying to you right now. Stop thinking about them, go out there & explore!! See what's really out there.
And if you feel like giving up after exploring, don't. Stop staring at the ground, look up, open your eyes, and see the wonderful scenery your in. Will it be painful to try to look up? Of course! However, if you can overcome that pain and actually look up, you will see a marvelous sight that few other humans can see. A sight that is worth all the pain and troubles you will face in reaching it. Only then can you see the truth that exists in this world. Only then can you truly start your life as well.... you'll see :)
P.S. If it's not painful to try and look up, stop pretending your exploring!! Go out there and explore for real!"