I'd have to say I've had two incidents thus far in my life you could label as depressive. When I was in middle school, not only did I have to deal with the typical growing pains of a hormonal kid, but I had several close family members pass away in the span of a couple months. To say the least, it was traumatizing. I was a part of the "listen to music really loud" culture and could be labeled as reclusive. I still don't understand how my hearing is as good as it is today with how bad I abused it.
The second bout has been on-off for the past 10 months or so. Long story short I was in a relationship I thought could go far last fall/winter that abruptly ended, and I realized that I needed this person more than I had previously known. She depended upon me more than I did her when we were together, but somewhere along the way she started becoming cold towards me. I don't feel like spilling my guts, so I'll leave it at that. I've done a lot of existential deliberation lately that doesn't help much either.
It was amazing to have someone to finally depend on; all my stress went away, and I was better at dealing with people. Now I feel as though I could implode at any moment from the pressure building up from within.