Holy smokes, you look and sound exactly like my ISFJ brother. I'm not kidding. I know that doesn't prove anything, but it's true, for what it's worth. He's awesome by the way-- so you'd be in great company.
I'm a sensor who also started out very wobbly on the N/S divide, and looking back I just think it's funny. I love N types but I wouldn't trade in my S for anything.