Most Helpful Girl
Every guy likes something different. I know guys who like thick girls and I know guys who wouldn't touch a thick girl with a ten foot pole. Everybody has their own preference. I say try to be the best you can be and don't beat up yourself. If you work out regularly and take care of yourself then at least you'll know you're the best you can possibly be. You'll never know just how good you can look until you work really hard at it.
Don't be one of those girls that complain about guys liking slim girls all while shoving cookies down your throat. I have some friends like that and they annoy the heck out of me. Get up and be the best YOU you can possibly be. If you rarely exercise or you know your eating habits suck then you know for a fact that you do not look as good as you could, and that applies to EVERYONE, slim or not. I am one of those skinny girls that weigh 110 lbs., I am very fit and active, however, my eating habits suck HORRIBLY. Because of my terrible eating, I know that even I could look even better than I do now because your diet does greatly affect how you look. I know firsthand how hard it can be to motivate yourself, but just because something is hard doesn't mean it's impossible ;) Taking care of yourself and being healthy is universally attractive!