How can I make new friends?

;( im 19 years old female. and i have no girl friends. i mean i have acquaintance's that are girls but not a real true friend. ;( im not ugly at all, I am a really sweet girl. but i work full time and it hurts when i come home and have no one to talk to. My bf of over 2 years is gone for 2 months in france..so i am really lonely. ;( i just don't understand why i have no one. When i see girls go out with their friends i look down and get depressed ..but i feel happy for them. please someone give me advice on where and how to make new friends ..please