Let me let you in on a little secret

. Life's not perfect and neither are our bodies. There's often no choice but to make the best of our situations and work with what we've got rather than wishing for something unrealistic that "aint gonna happen".
Here's an example. I'm short, 5'1.5", and very curvy. Always have been, never was one of this thin types without an ass, some hips, thick legs. Some people are more stocky and put on muscle easier and other body types are thin and small muscles even when toned. I'm the former. So I realized about 14 years ago when I first starting working out in gyms that the only way I would be able to maintain a sexy looking body and still be able to eat even partially the amount of food I not only need, but WANT (like most of us on here, I like to eat and I get hungry a lot as well), is to build up my muscles and consequently speed up my metabolism to burn more calories.
My choice was either to be flabby and over time it would become impossible to manage my weight and control the natural weight gain people have when they dont make a specific effort, or be more bulky/muscular yet curvy (I'm not talking body builder type as for that you need to be really lean, work out for hours and hours, and often be on steroids). The thin thing just wasn't ever going to happen with my appetite; maybe for a short period of time while I stick out some austere diet but definitely not in the long term. So I really only had two choices: (a) curvy but muscular and toned or (b) curvy and fat.
Sometimes I'd rather not have these bulky muscular legs, but the leg muscles burn an awful lot of calories because they're huge and when you work the larger muscle groups you also burn more calories. So if the result of burning more calories so I can afford to eat more and not gain is larger leg muscles, I'd roll with it. Be happy or at least come to terms with how you're made rather than trying to be something that may not work.
P.S. You sound really small already though so I would be even less inclined to worry about it.