I feel you. I think many of us share the same thoughts and concern. In a globally connected world with seemingly endless possibilities, social media with many Rapunzels and dating apps full of people, there is always the thought of "maybe it gets better".
My advice to you: you have a girl at your side who knows how much you appreciate her amazing hair, is even willing to grow it longer and it seems like she knows what to do during play time. That alone is worth a lot, like a looot.
If she has a great personality and you can imagine to live happily waking up beside her every day, ignore your thoughts the best you can and just enjoy