I'm going to stick out a bit here, because I feel an educated truth is better than a blissful lie.
Many people here are saying it's good, and trying to just give you encouragement to do what you want, because if you FEEL sexy you look sexy, but if you feel awkward....
But in look itself, just like with diet, and just like with exercise, there is no one size fits all answer.
How you look in them, if you stick out, is based on a few things. I'm about 6'2", so have had to put a lot of thought and research into it.... because nothing is scarier than a girl who can kick a hole in something while in heels! XD
Anyhow, for sticking out, I used to feel like I'd be a sore thumb being tall in itself. However, hang at a casino for a while and just observe, many girls wear heels that make them look taller than me: Sometimes they're still less, but they LOOK taller. Even at Wal-Mart and the movie theater, I see a girl in flats who is as tall as me... some are "eh", some are STUNNING.
My point is, don't let people give false encouragement, but make an educated decisions since you really care about NOT sticking out. Start by figuring out what the dress to what you're going to is. You're OBVIOUSLY going to stick out wearing heels to WalMart, if you overdress otherwise as well. Most people just going to Wal-Mart don't push a cart in heels, so you're going to bring more attention to yourself, attention you sound like you do not want.
It also matters WHAT heels you wear. Some heels will make you look more petite - several comments here about shrinking the appearance of your feet is great advice! If you're bulky, you don't want to wear a fur coat because it adds too much bulk. If you're thin or muscular, you want to SOFTEN the appearance of your body some, to get clocked less, if it's a concern for you.
Some rules apply to shoes like that, though I don't know all the rules... but once you learn, shopping is half the fun! <3