How do you cope with the death of a friend who should have lived much longer?

I just recently lost a friend of mine to Cancer.

All the deaths I have dealt with in life so far have been older relatives.

This is different though, because she was my good friend. It feels different. She was only 50 years old. (I am 32).

Can anyone relate to me at all? How did you cope with it?
Update: I can't tell you all enough how much your answers are all helping me... Thank you...
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