I basically agree with everything Atmosfear said. I think it's crucial that you speak with a counselor or therapist soon. If you think you have depression, you probably do.

And if you are diagnosed with depression, know that shit gets better. I was diagnosed with depression in 2004. With the right meds I eventually started feeling better. In 2008 I stopped seeing a therapist and in late 2009 I stopped taking my medicine. I haven't displayed any signs of depression since then.