Do anda think that everything l says is a lie?

l is very secretive, and when he berkata that he didn't suspect Light as Kira all the times he was lying. How do we know if the personality he's brought up in Death Note is just a fake? He may have pretending to like sweets, sit in an odd way, and hunch over, maybe at jantung he's just like Light. I mean l and Light are very similar, anyways. And if anda read the one-shot, it berkata that he doesn't really care about justice, he was just bored. That's the strange thing about L, anda don't know what's real what's not. He berkata himself that "he is a monster that lies."