OK, I just wanted to double check. I can't tell you how many posts I've read here from CDs throughout the years, where the idea of being a woman would not be worthwhile unless they could be the type of woman that turns heads ... you know, the sexy, beautiful and well dressed, curvaceous woman that men look at (and want). The beautiful woman you describe in your first post. And the idea of being the ordinary woman who fills the malls of America, with her average looks, average body, and average clothes, the woman that men DON'T pay particular attention to, just doesn't occur to many TGs. And so it is the idea of being a beautiful woman that is exciting, more than just being an average woman. :p
I don't know what you look like and you may well tip the scale in terms of attractiveness already, but I'm just saying that being a woman in and of itself does not change body shape in terms of basic skeletal build (yes, you will have real breasts and wider hips than in guy mode but everything else will be the same), and does not change the shape and the spacing of your facial features, your jaw line, the length of your neck, your shoulder size, etc, ... all the things that spell the difference between model-like and average looks.
Also, if you have posted pics in TG forums or on Flickr and have gotten rave reviews, please don't forget that TGs tend to be very supportive of one another, and the reactions you get will not be the same as out in the real world. For example if you get tons of posts telling you how beautiful and natural you look, you will not get such comments or reactions in a grocery store and it is likely that most people won't notice you any more than you notice the average women who are there ... unless you already have model quality looks.
I don't think you'll be laughed at. If you are young enough, you'll be able to pass quite easily from a few feet away, at least as far as people not knowing for sure that you are a GM. You'll need to work on your voice though, since this is most definitely the give-away as soon as you interact with someone. Actually, your voice and your facial profile. But, my SO and I are discovering there are many people who do know she is trans (not a natal woman) now that she has emerged from the shadows when she is out and she is interacting with people, and she does get treated with respect by everyone in the service industry. :)
I'm not wanting to dissuade you or anything, just wanting to give you as realistic an outlook as I can. Only you know what your motives are, so if you do feel internally that you are a woman then by all means you need to explore this.
My last thought is, if you haven't gone out in public yet, please start doing this now, and do it a lot over the next year or two, at least 3-4 times per week. Get to know people in femme mode. Get a taste of what it is really like, and I can't help but think this will resolve many of your unanswered questions.