The misconception is that you'll find someone who is perfect to you. That you'll have attraction and passion and be compatible in every way. And you'll be head over heels in love with each other and best friends and never dream of leaving each other or ever even want to.
The reality is not this. The reality is you'll find someone you love, but sometimes you may not like them. You'll argue and fight and have a lot of differences that sometimes cause problems.
The key is to make the choice. Being with someone you love isn't about some fairy tale romance where nothing goes wrong. It's about deciding that the person you're with is worth every negative thing they have to offer and committing to make it work forever.
You don't just happen upon an amazing relationship if you wait long enough. You create one once you find someone you feel is worth the effort and once you choose that no matter what, you love the other person enough to make it work and they love you just the same.