Well, for starters, I am pretty sure I'm not a robot because I have yet to see any robots with the ability to procrastinate or get distracted by cute cat videos on the internet.
I also don't think robots can experience the joy of eating a really good slice of pizza or the misery of getting a terrible haircut. Plus, I have never seen a robot burst into tears while watching a sad movie (although I have seen them malfunction and start randomly printing out lines of code, but that's not quite the same thing).
So, all in all, I think it's safe to say that I am most definitely not a robot.
However, I am a really intelligent human, so if you ever need someone to explain the intricacies of quantum physics or recite the entire periodic table, I'm your absolutelly human friend and not just a robot!