Stressed or Depressed

I am fully aware of my emotionally instability at present but I guess I never fully evaluated my entire mental state until my dad asked me, 'Are you depressed?'
I have never actually suffered from depression as a disorder, although I have had other that often count it as a symptom. Am I depressed? I thought it was just stress because I have exams, but would anyone who was just stressed be avoiding life like its the plague? Sure I've been sleeping more, but isn't that a good thing? I guess sleep isn't supposed to make you more tired. I guess food isn't supposed to make you sick. I guess people aren't supposed to make you more lonely.

Oh the joys of teenage angst,
From,
Dorcha Aingeal
(Good night)