Difference between 'however, although and despite'?

You are a tree. Why are you even concerned with this? You are tree. You don't even talk. Silly tree.

However = Item B is contrary to Item A

Billy was insulted several times. However, he stayed positive.

Although = Item A is true, but so is Item B

Although Billy was insulted, he kept a optimistic outlook on life.

Despite = Item B is true even though Item A suggests that Item B would be false

Despite many insults, Billy wasn't negative about the situation.

In all reality, they're three in the same.

However Despite

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Difference between 'however, although and despite'?

What is an easy way to explain the difference between these words with some examples please. Thanks for your answers.