Assalamualaikum. I have found this. It made me realize that we should be grateful about everything. Because we are alive. We are the chosen person to have this kind of life. Don't ever ask.

Why I have to go through this life?

Allah created us. Allah chooses us to be His slave. We are the best creature. We are not an animal, you must be grateful for that.
Allah chooses us to be one of the Muslims. We are the chosen. Then, why don't we try to satisfy Allah desire? He does everything for us. He gives us this life.

Don't ask because we never know what might be happen tomorrow.
Maybe today you are poor, maybe tomorrow you will be rich.
Maybe today you have a lot of problems, maybe tomorrow you will be matured enough to walk alone in this gigantic world.