Am i depressed?please help?

im not sure whats wrong with me at the minute?i never leave my house,not to go shopping or to go out?im with my boyfriend all day everyday,i love him to pieces and love being with him.but i just feel down and cant be bothered?ive fell out with mu family and don't really feel happy?i used to be lively happy and smiled loads?but not now?could this be because im bord?i don't go anywhere or socialise with anyone?i don't feel like i want to die or anything like that?just feel down and cant be bothered?am i depressed?and if im not am i leading to be depressed?if so how can i stop this from happening?