Skinny Girls

I feel so self conscience of my body and I'm trying to overcome that, but It's really hard when you're constantly surrounded by girls who wear a single digit size and are really pretty. In my opinion they would be even prettier without mounds of makeup and tight clothing, but that's just me. Do they starve themselves to maintain the size and go to the gym everyday? Maybe they're just naturally small? Whatever the reason, my initial thoughts are to try and lose enough weight to look like them, but I just need to lose enough to be healthier and become comfortable in my own skin, really. :)