Even if I told them it all, they wouldn't know the half

from Machine Gun Kelly (Ft. Ester Dean) – Invincible Lyrics on Rap Genius

Meaning

MGK could explain his life story to those who have had it better than them but they would never understand the kind of things he’s been through.

This line and the previous line he speaks on during a HipHopDX interview:

I really just think that the things I’ve held back on are just things that – Again, people already can’t really handle my personality at what I’ve given them. So it’s like, dude, if you can’t handle this shit you definitely can’t handle me speaking on the drugs I was doing; you definitely can’t handle – Fuck, I talked about sticking it in a girl’s ass and people fuckin’ spazzed like, “My God, you’re the devil.” And I’m like, “Fuck you. I’m just a kid doing shit that everyone else is doing behind closed doors and speaking on it.” So they’re definitely not ready to hear about me and my battle with substances; they’re definitely not ready to hear about shit that went on in my family. Fuck people, man, they’re not ready for that shit. Maybe I’ll give it to ‘em one day when I get some respect and people actually accept who I am as a person.

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