Hmm...are u the type that like to stay at home and doenst like to socialize? If yes, that the problem. Try to make some friend and hang out with friends or join some activities. As for guys, i am not so sure coz it depends on that individual. Some prefer shy while some prefer the active type girls.

Anyway, dun force yourself into a relationship just because your siblings arent single anymore. Do what is best for you and dun live ur life completely based on what u see on other people.