TBH, it's exactly the same for me too.

It's really amazing how much the human mind adapts both upwards and downwards. These days I find myself sad about the same kinds of stuff as everyone around me (money, relationships, etc.), and I honestly don't think about where I was just ~6 years ago.

But in really down times, I do find it a mental panacea to just remind myself about my past which pretty much instantly solves any feelings of depression.