I gotta ask - do you always tuck your shirt in? I really don't at this point, so I never wear belts (unless I'm wearing a suit or something, obviously, in which case I both tuck and wear a belt). I try to size my jeans so they'll stay up without one. If I did wear a belt, it wouldn't serve a function, and it would only be visible inasmuch as it would create an unsightly bulge at my waistline.
Anyone who knows me knows I never, ever, wear a shirt. Henleys, sweatshirts, and sweaters. So, the belt usually shows, at least somewhat, and it shows when you are moving around. As for it having to be visible. C'mon. Do you wear nice socks? Do you only get out of your PJs to leave the house? It has nothing to do with showing someone else, and a lot to do with feeling good.