I would like mobs to be hostile in creative mode Minecraft?

I don't
thing there's a mod but you can get sumthing called god mode when your in survival but you can't die also i think you can spawn dogs
hit one maby they will attack you or maby you can try spawning abounch of zombies, skeleton, Etc. And go in survivial and change back to creative quick than maby thell chase u

It's impossible without modding. But there are two mobs that do attack you in creative. They are the zombie pigmen and dogs. Or you can change your mode to survival by hitting / then you type gamemode 0.

Micheal you are the dumb one. In creative mode hostile mobs don't attack you. There's no way to change that.