It's a lovely idea, sort of, but do the maths! If there's really only one person in all of space and time that it's your other half. Boy, most of the human population lives an unfulfilled existence.
Get your head out of the clouds and rejoice in all the amazing fallible, confused, nearly right, annoying, wonderful people who are in your life!
I think the concept of a soul mate is real and genuine. Each and every person has that one someone who will always make you feel better, always make you happy, and is supposed to be with you for the rest of your life. It is to amazing not to think it exists.