Hands up if you've ever gone out of your way to avoid riding hills?
Or maybe you have one you can't avoid on your commute, but you hate it and everyone else seems to just glide up past you, spinning their pedals happily and putting in seemingly a fraction of the effort you are!?
Good news!
Unless you are attempting an epic climb at a 15% incline, there is (probably…) nothing wrong with you - you may just need a "friendlier" gear ratio for your fitness and strength!