Anyone who is trying to "find themself" is brooding and angsty. The whole movie supports that attitude. Everything is dark (every shot of Krypton makes the Batcave look like disneyland from a mood perspective, and every Kryptonian appears to only wear black), the characters are acting like jerks (wanting Clark to let kids drown just being one example) and everything just seems to be around to be somber. I'm not pulling this stuff out of thin air, the trailers are show casing the dark/angsty stuff constantly.
Maybe you're just projecting your issues onto the film? I have had many clients who are searching to find themselves and for many of them it is often an exciting time and even an adventure as they uncover who they really are and who they want to be.