Mant times all boys schools have sister schools that are for all girls that you can gather together for dances and other social activities. You could get out and join some sporting groups or go to some classes to learn a new activity like snow boarding in the winter and boating in the summer. But in this age of technology on-line social networking sites are a really easy way to meet girls. Ask your friends about their sister's friends or even their cousins, put yourself out there and meet new people. Have fun!