You can still see your dick if you get fat. And if you get fat it still looks average comparatively, instead of being a little nubbin.
But really, mine was strictly average through my teens until I hit a weird growth spurt right as I was turning 21. And having seen both sides of the fence, I can confidently report that nothing much changes. Life is still get up, coffee, shit, shower, work, lunch, work, dinner, little errands, read, possibly visit a friend or just read a bit more, sex, cuddle, sleep.
Ways in which it changed my life at all:
-Gym shorts generally look gross. This can be avoided somewhat w/ the right underwear, but generally I like loose boxers the best, and those are a disaster now with gym shorts. Tighter underwear scrunches everything up in a way that makes me feel all eunuchy, yet it's come to the point that they dominate my underwear drawer.
-Arousal can be hard to hide in jeans. This is something I never worried about before, as my average erection would be pretty hard to notice behind the "tent" of the zipper area. You'd have to be really be looking. Now it's just clownish. Similar to the gym shorts thing.
-Fiance loves the added girth for penetration--loves it quite a bit--but I don't fit into her mouth nearly as easily, and blowjobs generally can be frustrating.
-Fiance got a kick out of our little measuring sessions during the spurt.
-Am teased about it sometimes by the three non-fiance people that know about it (her best friend and her parents). And now that my best male friend is seriously dating her best friend there's the weirdness that she likely has mentioned it, and he's such a repressed mess sexually that this will never not be very weird.
-My best female friend--who in terms of sexual repression is the mirror opposite of my male bud--became a bit more flirty with me. Of course this could be for many reasons, or for no reason, so, yeah. I filled out during the spurt in stature and facial hair (lol) and just all-around I stopped looking like a boy-person who'd underwent only the bare requirements of puberty, so maybe she just liked that look. Yet, when we'd about our sex lives, she started making a weird amount of comments to the effect that while she loved the loveydovey-type sex with her effete big-glasses musician boyfriend, she also sometimes yearned for a more stereotypically masculine, he-man lover to just fuck the shit out of but not love. (At which point I'd mention that I felt privileged to enjoy both modes of lovemaking with my fiancee depending on our moods, which served as a tidy way of keeping the fact that I had a fiance firmly in the conversation.) And while the comments never literally involved size, there was an odd knowing tone of voice on her part that was kinda discomfiting. And she's someone whom I wouldn't have worried about the gym-shorts grossness around. And yeah, I probably made a few too many comments about my constantly changing shoe size. And yeah, I probably made them in ways that were obviously innuendo for the changes in "size" that I was actually thinking about. I was determined to not brag about it to anyone but my fiance (because she has already seen the worst of me, she can take it), so allowing myself those silly little comments seemed OK. In retrospect, I probably teased her.
-Still don't get the toilet-water thing. All the toilets I use, your cock would have to be a small human to dip all the way down there.
-Easier and more satisfying to masturbate with. I remember feeling frustrated that I didn't have more shaft to really pump away at when in the shower.
Can't think of anything else.