Why do people like my sister better than me?

hey, so my names Shelby and I'm 14yrs. my younger sister is 13yrs old and I'm starting to realize that people like her beter than me.. I mean, she's friends with ALL of MY friends and they seems to like her better ): But whenever she bring her friends over our house she never let's me at least speak to them or introduce myself. I think that's so unfair of her to do that because I let her talk to my friends! And even in my family I think everyone likes her better than me. Everytime I'm fighting with her she gets away with everything and she ALWAYS gets her way! It gets me so mad and I feel so worthless.. Me and he are so much alike though. People mistake us for twins when they first meet us though, lol :) I don't hate my sister, I just hate how everyone thinks she's more "loud& fun" than me.. I joke around and I'm a really loud person around my closests friends, too. And when me and my sister hang out with this friend in my neighborhood that's 14 too, my friend always thinks it's boring without my sister.. I hate that! It makes me feel like a really boring person when I'm really not! I'm actually the one that likes being adventurous and always up to goof around. What do I do? I hate how everyone thinks she's "better" than me.. helpp /: