Thinking about existence

Okay guys. I am bored today and decided to write something which might shock you. Okay, back to the main point.
I have a habit of wondering life and beyond. I wonder what is universe? What is Earth? What is life? What are humans?...... Don't be freaked out. Don't you do the same? Everyday my mind is all of rubbish. I think how long is the universe, what does the end of the universe look like? These are questions human beings are impossible to answer, no matter how hard we tried. I wonder what is the feeling when we died. Do we just die, or do we feel immense pain. Is there a world after Death? If there is, is it possible for us to stay there for an eternity? Is not, will we die again and go into another world? Enough. i even wonder why i write this post, maybe to share my wonder and the answers i want to know- why are we here? Is there a reason for......
I feel sadness that we can only live for at most 100 years(well, if you look at a larger picture, the oldest person is 120 years old). Is there a medicine that allows us to be immortal? Will there be a time when robots serve us? I feel uneasy that these strange and yet extremely important questions are not answered.
These questions cannot be answered. I am afraid i'll just have to leave it as it is............