You don't need to. You're young, why not try wait for someone to want your attention? Enjoy being single :)
Just start being social. Talk to the guy you like. Become friends first, and go from there. But don't go out of your way to get guys to notice you, especially if he doesn't seem that into you in the first place.
Just be yourself..there's no hurry..
If there's a guy you like, and time is short..just tell him how you feel..he's leaving anyway..so if he says yes - Skype and stuff..if he says no - you never have to see him again.