[TOMT] semi-popular horror movie that came out less than 5 years ago.

potential spoilers

I know a lot about this move so i'll list scenes.

movie starts off, guy, child, wife eating dinner, put kid to bed, home invasion happens, guy gets kidnapped thrown into room with 3 other people, one guy is in very rough shape.

This movie goes back to a kids past, (he's the killer) and he is getting bullied by those 3 people, this is not revealed until later.

It shows them making him eat bugs and shit, so he gets revenge on all of them by doing said things to them back but even worse.

post credit scene is one of the persons daughter near the house they were imprisoned at and her friend goes "wasnt ur dad kidnapped near here hehe xd" and she goes "yeah but the guy is dead! my dad killed him! and she replied "but there was no body found?"

boom credits again.

please help, i love you all

edit: if it helps it has a masked killer who gets unmasked by the end

its not the final, i've only gotten that too. =(