The second we enter this cold and harsh world, every choice we will ever make, and ever opportunity we will ever had is already planned. You don't get to choose the world you enter and you don't get to choose the life you will have to live. That is decided by how you come into this world
Whoever gives birth to you will control your life in a million and one ways. They will decide whether or not you believe in a higher power, whether or not you will like or dislike a lot of things you will do in your life and so many other things. They pretty much have full control of your life until you become grown up and go out on your own. You are so sheltered in your own home that by the time you grow up and move out and go into the real world, you will have so many firsts, because of all the things your parents sheltered you from growing up. Obviously depending on who raised you and what their opinions were, the things you were or weren't sheltered from were a lot different. Our parents or guardians control our choices almost completely. This relates to Shakespeare's Hamlet ""His greatness weighed, his will is not his own, For he himself is the subject to his birth. He may not, as undervalued persons do, carve for himself for his choice depends the safety and health of this whole state." (1.3. 17-21) because Hamlet came into this world with all of his choices already mapped out for him. Obviously you will get rebel children every once in a few who "make their own choices" and "do what they want" but most children follow the rules out of fear. We make the choices our parents tell us to make because we are scared of them being disappointed or mad; the consequences.
In school we follow the rules out of fear, we do what teachers and administrators want us to do because we don't want them to be mad or to punish us, and then get double punished by our parents.
Another thing that controls our choices that is different for every person; our church. Every religion has different rules and laws that if we believe in a higher power, we follow them. A lot of the choices we make also involve our church and how we will be rewarded/punished when we get to heaven, or the opposite if we don't follow these sacred rules. I do not really want to talk about religion in this blog, so that's the end of that.
Morality is the principles concerning the distinction between right and wrong or good and bad behavior. Our morals that were drilled into us growing up will also influence our choices. Although we know are morals are what is right, that doesn't mean we always want to follow them. If that makes any sense. That still ties into the overall topic of us following whatever our parents want us to so they are not disappointed in us.
Maybe it is just me but overall pretty much the only thing that determines my choices is God and my parents. Although I sometimes don't follow those 2 if I think I can hide it or just ask for forgiveness, they are both something I always think about when making decisions.