Synonym for "isn't truly happy with who he is"?

What would be an appropriate, more condensed way to say "isn't truly happy with who he is" without having the negative in the sentence? This sentence is part of an essay where I discuss how a character tries to escape from reality and makes himself seem better than he really is.

Thank you

Solution 1:

Sounds like he's not comfortable in his own skin

(idiomatic) Relaxed and confident in one's manner of presenting oneself and interacting with others; conveying the impression that one has a clear, satisfying understanding of one's own abilities and situation.

wiktionary

Solution 2:

How about unfulfilled?

From the Cambridge English Dictionary:

​unhappy because you ​think you should be ​achieving more in ​your ​life