Sensory-wise my hallucinations are very real, but there are some dead giveaways that it's a hallucination that I can sometimes spot, like if I hear voices when no one's around or if I see people that couldn't have come from anywhere. But if there are people around already it's very hard for me to tell whether I'm hallucinating. Like I will overhear conversations between people I know that don't actually happen and I wouldn't know it unless they insisted they didn't say that or if it didn't go away with my meds...

But yeah basically I ACTUALLY see and hear things, not just a mental image or a voice "in my head" like people might expect.