Shit I wish someone told me when I was 20. An irregularly updated book.
Learn about ego. Read Freud. Learn what motivates people. It'll help. A great, short book is "Ego is the Enemy".
The superego is joyless and boring, but it's there for a reason.
This applies, btw, to not just losses but all kinds of situations. Memorizing this will help you and it will help you help others.
This site is about advice for family and friends that are graduating from college or high school.