You were taught that someone other than you should decide about your life. Health care, big business, government, to name a few, all reinforce that you are not the one making decisions about your body, what you put into it and how you should live.
You were trained through repeated exposure to view any answers to questions to be outside of you, in someone or something else.
It was all done slowly, over time.
Replacing synergy in your body and life, with scrambling to keep up with what someone else thinks is good for you from self-serving purposes.