This whole thought process of yours interferes and causes a ripple in the calm tranquil sea of your emotions. What if you didn't have emotions, what of you then? Would you really care if you were hallucinating your existence or not? Would you care if everyone around you was real or not? I don't think so. Take everything for what it is. Feeling upset over something like this is generally a good indication that you and everyone around you is real and independent of your existence. It's ignorant and arrogant to say that you are hallucinating other people.