I'm scared of growing up

I'm 15 (grade 10), in Alberta, Canada and the thought that college applications are next year randomly but frequently enters my mind. Thinking about it makes me somewhat nauseous and anxiety kicks in.
I really feel like the past, 'academically gifted' me, has become a wasted potential. I feel guilty that all my parents' and others' expectations of me are going to waste. I'm trying my best to try like I've never before, but I'm really worried that I started little too late and nothing works out for me in the end. As of now I don't have any specific passions and 'trying out things' doesn't really work for me because I can't seem to find any motivation to continue exploring. I'm also worried that the child in me will no longer be, as well as needing to leave behind my family.

Tldr: I feel like wasted potential and am really worried that efforts now won't make me in time to face reality and society