Everyone is built different. And really all you can do is work to gain muscle and definition in the areas your considering a problem. So your going to have to concentrate on those areas (calves and thighs) and realize there is a trade off for everything. You may lose some flexibility in the process.

If your built more thin like you will probably never have big built legs like some girls have, just like they could never have what you have and trust me many really want that. You could do leg lifts, 100 in each leg every day. U won't have legs like some, but may add definition . Besides , a lot of girls with bigger legs , almost all I bet have stretch marks, doesn't mean they are fat, it's just the way it is. I allways was more the curved type and I ran cross country and did well and still had big legs and a little stretch marks, so be happy with what u have, some one is jealous of u.