You already know that you will eventually become what you consume. And if unchecked, the thoughts that you allow in your mind become your thoughts.
If you don’t believe in groupthink (yet) or you don’t think that you are being influenced by advertisements you encounter every day, think again. Most probably, you are brushing your teeth because an ad influenced you that having a fresh breath makes you pleasing.
Same goes with what you read, watch, and expose yourself into.
So what should you do? Be careful of the influences you allow and entertain. And make sure that what you will become is someone you won’t be ashamed of.