What's the biggest question you ever asked in your life?

I have been struggling with questions al, my life, Iam 18 now. The biggest question I was thinking about was : How big is the universe? The universe and the milkyway and such thing is really inspiring me, because it is hugeeeeee! And another question was : Are there any other life forms in our universe?

I guess my biggest question is on how God sees me. Does he think I have been a good person? Have I been a good follower of his word? Will he take me in his kingdom when I die?

I have been asking these questions since I was about 10 years; What is the purpose of my life and this world? Why are we here and what happens when we die? I remember as a little girl laying awake at night wondering these questions to the point of crying myself to sleep because I did not know the answers. At times when thinking about these questions I thought if I continued thinking about them as deep as I was that I would eventually go completely crazy. So now at the age of 55 years old I don't dwell on the subject but I still want to know what happens when we die and I want to know before I do die.

I guess the biggest question I have asked myself would be why does people have to go through so many challenges, difficulty and face so many problems which some of them will never be able to solved, just for the sake of living? I always see people struggling in their life and it doesn't get better no matter how hard they try. They are very unhappy with life yet they still want to continue suffering and live. If I was them I would probably not do that.