Hi chromechris, I too, am still quite a new forum-poster. So I hope you can be understanding of my response and ideas to your argument.
One important thing to point out is that physically, your parents created you.
God has known about you for thousands of years and knew he would create you long before you were made, and that your parents would be the ones to make you. And he picked and created these situations.
Even if God didn’t exist but the world did, you still wouldn’t technically have a say in whether or not you existed- this would be at the fault of your parents if this is what you think.
I’d like to think that God does not force his presence upon you. You have a choice whether or not to believe in him. This can be assumed to be included with free will.
Some people that are not theists might just believe that karma is how the world is run, or whatever they wish to believe, that there is a cycle to life. But whatever these beliefs are, there are always things that don’t exactly line up with what we are wanting for ourselves, or our own plans. People will always like to find something to put the blame on, since it is frustrating.
Some people would also say that it’s possible that God allows things to happen in your life that you do not necessarily agree with because it is important to your end-goal self, who you are meant to be. However this is less about your argument and more about the Problem of Evil, a whole other topic altogether.
Also, I know of no people whose parents drop them as soon as they turn 18. Maybe I have just been blessed in this sense. Some people might be thrown into authority of their own lives much earlier or much later, because this example varies so much- I don’t necessarily know that this could be included in your argument, perhaps another example should be used. Seeing as how most parents still take part in taking care of their child in some kind of aspect. And I wouldn’t necessarily think that the relationship you explained to be considered as “moral,” I would think that parents continuing to be caring would be more moral than the example you provided. Parents are still parents forever and ever into eternity. Would you argue that you wish you didn’t have parents as well if you think this way? If that were the case than you would be wishing that you did not exist. Would you argue that only your parents are the ones that “created” you?
Also many argue that God gives humans free will, which I will argue as well. Which means to me, that yes he does know what your life will consist of but does not “run you” as a slave-owner, as you stated. Did you learn this while you were a Christian? If not, I would be very surprised seeing as how it is an important part of theism.