Tegenhanger 

an existential double of a living person;

like doppelgänger, but in existence not appearance;

a person who is uncannily similar in terms of interest, behaviour and existence in general to you, to the point where it's scary but somehow epic simultaneously.

origin - Dutch translation of "counterpart"

DUDE! I Just spoke to this guy/girl, he's/she's exactly like me!

like a doppelgänger?

No, even better, a tegenhanger. Looks very different, but thinks and behaves exactly the same!

Tegenhanger by JN7397 July 19, 2014

teenanger

The ages 13-19, the 'infancy of adulthood' when physical beauty and rude animal health ironically combine with lack of resources, power and wordly wisdom to create an individual of towering self-loathing and monstrous hostility.

Pity the teenanger and remember what it was like to have the metabolism and beauty of a god, the pocketbook of a pauper, the political power of a field slave and the wisdom of a cretin.

teenanger by Mo Dixley October 17, 2005