Depression or is it a lack of value..

When I wake up every morning, I don't open the curtains..anymore. Instead I turn on two lights and yet, it feels dark inside. Am I depressed to see things this way or are these things around me stereotypes of depression. Maybe it could be both. But the fact that an idea of something can cast an impression on my mood makes me ask myself, "Why?". Is it because I'm weak or is it because im going crazy and slowly the words in my head have stopped working for me but are against me. Is this depression or am I just judging the matter far too deeply because I didn't get enough sleep last night? Its hard to say, maybe its both.