Seeing old videos or hearing old songs is weird for me.

When I was a kid I became very slowly depressed overtime. It didn't really hit me until I was 18 but it still had some effect in my childhood.

As a result, my brain just associates the past with joy. I see old shows or hear old songs and think, Things were so happy back then. I have to remind myself that it's just my personal outlook and not some objective thing.