Depression...am I depressed?

Every day I wake up I want it to be awesome, but all it takes it one simple thing to set me off.  I cry every day.  Sometimes it is just a couple of tears, other times it is full out bawling.  I don't want to go on any prescription drugs for this.  I have researched this and there are many things suggested.  I will try to exercise more.  I am trying to lose weight. My depressed nature started after my beloved sister passed away 2 years ago.  It has become worse especially after loosing my beautiful cat half a year ago.  I want to be happy.  I think most people think I am because I put on a happy face when most people are around.  Truthfully I don't think people want to hear about your sadness, it brings them down.  So, I suffer in silence.  Prayers and trying to take care of myself better is what I am trying now.  Fingers crossed it works.