As someone whose 18, I'm feeling the same. Honestly watch Whatever, it's how I found this site 2 years ago in the first place. Watching that movie really summarised how I feel with life both with notre heros and Raphael. I do think that we will be mentally missing something permenantly, something trapped in the past, a fragment of ourselves that we'll never be able to re-unite with or care for yet always feel it's presence hanging over us. I'd say try and get out there now, try make an effort before it's too late. If I'm trying you should too, like others said I feel like early 20s is once we're at a major disadvantage as by that point everyone's had relationship experience except for us and we most likely won't be worth other people's effort, ignoring all the other factors like looks, money career etc.