While I agree to a certain extent, one thing depression does do is isolate you from other people and this can actually (in my experience) make things work. Having a support network of two or three close people, who have done some reading on depression, and are just there for you whether they understand how you feel or not, can make a lot of difference, or at least it has for me.

But I think the others are right in that you have to be really careful who you open up to. And I realise a lot of people don't have anyone to open up to.