I feel as if my life is in a constant downhill skid. I don't feel as if I can't stop it, how do i stop it?

am i depressed? i hate my life, sometimes i just want to stay home and sleep all day because i am so much happier in my dreams. how do i get back to feeling happy again? this is taking a big toll on everything in my life. my relationships with family and friends, my schoolwork, my hopes and dreams.