I think a lot of us here (and maybe on forums in general) have depression issues and each of us have to respond to it in our own ways. For some, it could be a chemical imbalance, for others, life experiences, or maybe even a combination of the two.
The point is, and I think that was what Trolls was trying to point out, is that there is no One Size fits all approach to mental illness. If Steph can cheered up by cat pictures, who are we to say that's wrong?
Hang in there, Steph.