Why did Adolf Hitler shoot himself?

Answer 1:

Hitler knew that he couldn't win. He could see that his 'perfect empire' wasn't going to succeed and he realized that it was only a matter of time before his enemies caught him and killed them himself, perhaps in an undesirable way.

Answer 2:

He had more enemies than friends, it is a myth that he killed himself just after he overheard some of his NAZI buddies discuss how they were going to kill him