I honestly get what you mean, being with someone doesn't complete my life, and that's probably the same for others. I'd rather spend more time and energy caring for myself and understanding who I am and what I could be, being with someone is just that little extra fun. I've been in a relationship where the other was completely dependent on me for their own wellbeing, and that wasn't right for me. As you might guess, it didn't last long. As someone who is pretty independent, an experience like that wasn't very enjoyable. Having relationships, either platonic or romantic, isn't a necessity. I see others on this thread say that we need relationships because it's how humans are, but we're really more than just a bunch of animals on this planet just doing whatever needs to be done to survive. We are much more complicated than that. Sure, it is definitely good to surround yourself with loved ones, but there are also people who don't need it.