I Cannot Get This Out Of My Fucking Head But Idk How To Explain Itwhat If Noone Looks Like You Think

I cannot get this out of my fucking head but idk how to explain it what if noone looks like you think they do? what if noone talks the same language? what if people arent human? what if all these words are made up? what if you see these words and letters completely different? what if you hear me speak a different language and make different noises then the one I think I speak? what if everyone sees and hears things differently from everyone else, but we wouldn't know because our brains make us hallucinate and think their talking the same language as us, and their brains make them hallucinate and make me think im talking the same language as them? what if noone sees or hears or does anything the same?? what if its all in your mind, and everyone else has a different one???