Just so you know, you can wind up here, eventually, too.
The short of it is, that you'll be embarking on an entirely new life......a rebirth of sorts. Now I'll show you my starting point. I used to weigh in at 560+ pounds, and am now floating right up over or under the 300 pound mark.
I do understand about feeling self conscious. It's perfectly natural, but you cannot alow it to undermine you in your pursuit of a healthier life. Ironically, you may find even your friends and family unintentionally sabotaging you, because of either insecurities on their part, or simply the fear that you are "malnourished" because they are simply so used to seeing you as big, and suddenly, you're starting to look like a rail as compared to where you are now.