Mark Millar says the bulk of D.C. roster is not "Cinematic".

Spider-man is his strength.  He's Peter Parker before he is Spider-man.  The explanation he gave the kid in TASM about the mask making him stronger is how he is in the comics.  The mask is what gives him his confidence. 

When he goes on the date with Lois and is about to tell her his secret.  When he stands up straight, that's the real person.  He became Superman and shrugged off Clark.  He does the same thing in Superman 2 when he stuck his hand in the fire and got upset when she ultimately figured him out.  Same goes for when they are together in the FoS and when he's talking to his holo mom.  That's all the real Clark.  Yes, he's putting on a show when he tells her flying is the safest way to travel.  You can see that he's trolling her when he turns around and smiles. 

Part of it, yes.  The trying to be the "messenger of hope" Superman.  But the Kal El that's with the Justice League is the real one.  There is the Superman that's talking to journalist or a crowd, Clark Kent, and the Kal El that hangs with the Justice League and others that know his secret and grew up in Smallville.  That Kal El is usually different than the Clark in Metropolis.  And, yes, he does take pride in that article because that is not something that came to him from birth.