Ego is your sense of self.
It is how you make yourself unique and separate from everyone else in the world, by identifying as you.
The danger is that you can make yourself too unique.
This happens in one of 2 ways:
1. I'm awesome and the rest of you all suck, therefore I deserve special treatment
Or
2. I suck and the rest of you are all awesome, therefore I deserve special treatment.
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It's like I'm sleepwalking