You are so, so wrong. The reality is that we are far more than automated biological machines. We are conscious entities with the power and freedom to make our own choices. Of course I can choose whatever I want within the practical limits of what is physically possible for me to do. The choice is not automated, it is driven by my conscious will. This is reality.
Yes we try to obtain whatever it is that we want, but we do not, can not, choose what it is that we want in the first place. We discover our wants and try to act on them. Can you imagine a world in which we were not constrained this way ? A world wherein people could just decide to want what they do not want for no reason, for this is what your scenario implies. This is profoundly simple and profoundly true, that we want the things that we want and we do not want the things that we don't want and those things are ultimately not a matter of choice. This insight helps to explain the behaviours of not just humans, but everything and anything that exhibits behaviours. Have you tried my thought experiment of trying to want something that you don't want ? Tried wanting a homosexual affair ? Probably not, and the reason is blindingly simple, it is because you don't want to and there is nothing you can do about it. You are stuck with not wanting to be a homosexual and not wanting to be an atheist, but in other people their hopes and desires take a different course because they have had a different track through life. Can you imagine what it would be like to be a retired accountant wanting nothing more than to kill as many random people in Vegas as possible ? I can't either, to be honest, but I can at least understand the underlying principles of how cause and effect operate through minds to produce seemingly unthinkable behaviours and if cause and effect were not at work then there would be no Vegas and no accountants in the first place.
Things happen for a reason and it is good that that is the case. People do things for a reason and it is good that that is the case. Anything else would be utterly incomprehensible.