Fear of being everage at 16

Every day for the past 2 years I have weird feeling of not doing maximum, being boring and average.
That is why I starter doing a lot of things like 3D printing, running halfmaratons, coding and even starting pilot licence.
All of this I really enjoy but still I feel like not doing enough. It came to the point, where I feel bad, when I am chilling out.
I feel like I am in a rush all the time and I think that is not what I should feel like when still being a kid.

So I am asking what would you do in my situation.