Proving your existence to another person is impossible

Now I see why this debate is in the "philosophy" category. Anyways, this is what I have to say.Rebuttal:"Do you believe that you are in a dream when you are dreaming?" Actually, it depends on whether the reader is capable of lucid dreaming. As for me, usually I can only tell the difference between dream and reality after I wake up.Speaking of which, there are some differences between dream and reality I can think of.Dream: Takes place in the subconscious, usually when asleep. Pretty much anything can happen, and if you're capable of lucid dreaming, you can do anything. Dreams usually don't take place on a specific date, and you most likely aren't in a real place.Reality: Once you wake up from a dream, you can be certain you are awake, and in reality. You can't do anything you want, as physics act as a boundary. Reality takes place on a specific date, and you definitely are in a real place.Since dreaming and reality aren't the same thing, why assume reality itself is a dream? Sure, we could be dreaming, but what species can sleep for 50+ years, without anything but rest?Defense:"You have said that people see you at school every day, but that does not matter to me or anybody who is reading this"I concede I cannot prove to you I have been seen, but that's irrelevant. Since I exist, I am able to interact with people, who also exist, and impact the world. The resolution is not "Con must prove he exists", but rather "Is proving your own existence impossible?", and I have shown that I interacted with other people."If you did not exist then those words could still happen."What? I would like Pro to explain how a non-existent being can speak, or even type. This doesn't make sense.Argument:Point 1: I proved how I existHow many people knowing my existence does it take to disprove the resolution anyways? I doubt it's more than 10, which I have more than 20 acquaintances, both in reality, and this website. The question, however, is "Does humanity itself exist?".Point 2: Does humanity exist?In order for me to prove humanity's existence, we must ask these questions:1. Can we see humanity?To answer this question, just walk outside. You can see many people in your neighborhood. Since we can see humanity, it probably exists.2. Does humanity impact society?To answer this question, well, I made a list here: YouTube has youtubers, who exist and either talks about their own life, play video games, or even teach the viewers some things. Famous scientists invented things, such as Thomas Edison made the light bulb. (Someone might say Edison doesn't exist, but somebody had to have created the light bulb, otherwise it wouldn't exist!) Doctors cure sick patients. The patients are able to get sick since bacteria got into their bodies, which couldn't happen if the patient doesn't even exist. Since humanity can impact society, it must have some form of existence.3. Can we touch humanity?Yes we can. I'll just stop here to avoid innuendos.Under these criteria, humanity most likely exists. You can't physically see me, but just me being capable of posting this argument would suffice as proof, wouldn't it?This is round 2 out of 3, so I'm a little worried. But alas, what are Pro's thoughts?