And I say I'm inadequate because, despite the hours of practice I've put in...I still can't fast-switch fast enough to save my life.
FS isn't such a problem if you have the right scroll button, with a rough surface so that you have a better grip. The aiming is a tad bit more difficult. But like DarKFirE said, people get better by every passing minute, so you shouldn't need to critize yourself so much about it.
And glad you've decided to stay mate.
