Some of the best looking 23 year olds I know, were hanging in their school years. Whereas a fair few of the best looking kids at school peaked too soon and are already on the steady decline.
The ugly duckling effect is real. But even if you aren't the best looker, you'll realise with time how little importance looks have. Some of the least attractive guys I know seem to have happy, long term relationships.
It doesn't effect your chances of being happy and finding someone. However at the same time, don't be a silly sausage and aim too far above your station, because you'll get rejected, and will end up lonely, and bitter. And before you know it you'll be creating hate-fuelled misogynstic or anti-feminist threads whilst crying into your pillow every night.