Insecure & Skinny

So I know a lot of girls always complain about their bodies and how they would love to be skinny. But I actually have the exact opposite issue. I swear no matter how much I eat I just can't seem to gain weight. Most women I tell this to say it's a blessing but it feels like a curse. I can't stand being so tiny and it's upsetting because nothing ever fits. (I'm 5'4 101lbs) It makes me feel unattractive and wish so badly that my body would just hold on to some fat every once and awhile. I know it's weird and very backwards but that's how I feel.