Are girls that are really thin bad?

I'm one of those girls that can eat whatever and as much as she wants and won't gain an ounce, but I'm really really thin. Not unhealthy thin, but I've had people ask me if I"m anorexic (and I'm not). I think It's because I'm bony, but I eat 3+ meals a day. Guys, Is this unattractive? I've tried to gain weight (by working out and changing my diet), but my body keeps itself around 100-103. I was just wondering.
Are girls that are really thin bad?
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