Why did God put you
in your body and mind?
Others care for you
Others care for you. Others may try to take care of you. Others may tell you what you should do or not do. Ultimately, however, that's not their primary job. Their primary job is to take care of themselves, just as it's your primary job to take care of yourself.
It's your job
Others can assist in taking care of yourself. But again, ultimately, it's your job. It's your job to decide what is best for you or not. It's your job to say "yes" or "no" for what fits you best. It's your job to make requests to serve your wants and needs. It's your job to create and maintain the best boundaries to foster the best relationships with others.
This is the reason that God (nature) put you in your body, your mind, your spirit.