If God is the One who gave this all to you, then it is no wonder that you are angry. This next question is asked sincerely: How do you know that it was God that gave this to you?

May I ask what prayer means to you? There is no such thing as prayer in my religion so I looked up the definition. Merriam-Webster defines prayer as "words spoken to God" as their primary definition. The Oxford dictionary defines prayer this way: "a solemn request for help or expression of thanks to God or an object of worship". Those definitions are sufficiently different to me that I think it matters how you define prayer.

If you are angry at God, then telling Him that you are angry at Him would meet the first definition but not the second. My religion doesn't have a God either so I don't have experience in this but I know that if I am angry at a person, communication is often key. I tell the person that I am angry at them and why. Then I listen to their response.

Again, I don't know about God - but I know that most people who do believe think that God is omniscient. Therefore, if you wrote a letter to Him, he would know the contents.

I'm not sure what you would be asking Him...perhaps 'why'? Or maybe for relief? Perhaps though you might ask for understanding or acceptance. In my life I was subjected to horrid abuse in early childhood that resulted in mental health issues. If not me, then perhaps it would have been my siblings. If that is true, then I'm glad it was me. Perhaps if there is a God, and if He is omniscient, then He knew that I would feel that way today and so He gave me my wish before I ever wished it.

My next wish is for you to feel peace.