Anything you read, watch or experience you become.
Apart from some pre-determined input from your DNA you come into this world with a mind that is a near empty bucket. By default this bucket is filled with your experiences from within the womb since you will be aware of inputs such as sound and motion before even you are born.
Unfortunately before the age of 18 you have a diminishing percentage of control the younger you are over the hand you are dealt with of your inputs from your environment. You become whatever those inputs are, so if you were badly treated as a child the chances are if this pattern is allowed to continue, you will be treating your own children badly as an adult.
From the age of 18 you are the master of your own destiny. No longer can you place at the door of those around you the responsibility for what you will become in the future from the age you turn 18. You are responsible for changing the patterns in your brain, of trading the hand you were dealt with for better cards.
You are this moment the sum of all the experiences of your life, these are like a pair of hands that have shaped the clay of your mind into certain patterns via how your brain cells have been linked up. These brain cells are like clay, they can be changed into anything you please, though the deeper the pattern the longer and the harder it shall be to mould a new pattern. Nothing is fixed in your brain, all is flexible to change, though age is a factor in how fast the changes shall be if you change a pattern.
People who are lazy, stupid and needy hand their brains to others to mould for them. Everything you do and think become the hands that mould your brain cells into new patterns into what you will become in the future. If you decide to allow yourself to be brainwashed by television or other toxic inputs then you have yourself to blame for the person you will become as a result of those inputs.
You are a clay master of your own brain, you can be anything you choose to be if you actively mould your brain in the right way. The responsibility is down to you to think and do to become what you shall be in the future.