Is anyone else feeling like that?

I'm already 15 by now, but that scares me. Like, "I'm already 15?! The time has passed so fast!!" And I can't just be standing here thinking about how many time I already lost, because I would be losing time by thinking about the past. 

So I think to myself "What should I do?!! I'm losing time!! But then I remember that I don't know what to do.

Being 15 should be amazing, but I feel like burned trash.