it's making me depressed and I hate it

We have parties at my house like every weekend, and every guy that's there always says how my sister is hot (she's 16, I'm 17) but I don't look 17 I look younger than her)) not one has said I was pretty or anything and it really upsets me, I go to make new friends and meet new people and there all over my sister. I feel like it's bringing my self esteem down and I hate it, I could literally cry cuz it has me upset, she's always been the prettier one. What can I do?:(