I've always been a good student, top 10% of my class at a top-tier college. I accomplished things while being extremely lazy, only working at the last minutes. And still get decent (not great) results..
Relax about it. Don't make things harder than they are right now.
One day you'll want to do stuff that is really challenging and productive, and you'll manage.
Creating fictional hardships from this odd feeling would just be silly.