How do you learn to not do insane things? How do you even know what is or isn't... impossible? The moment you step off a building and do not fall, either you're crazy, or the world is. Either way, you're no longer bounded by any rules.
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Keep your aspirations to yourself. Telling anyone in your household or social strata about your plans to get out and do better may be met with bitterness and downright ridicule. People will call you uppity for wanting to go to school or stupid for having a career goal that isn't modest and local and vaguely dead-end. People will tell you that you have no common sense simply because you refuse to see the world in terms of pure survival.