I suspect people view their childhood and/or late teens through rose colored glasses, they remember the isolated moments of joy without the surrounding context, I remember being stressed about exams, unsure about the future, unsure of even my own identity, plenty of other concerns, but sure I enjoyed a few sleepovers and gaming sessions with friends but when we're remembering those days fondly it is from a safe perspective knowing all those concerns were resolved in a positive way, a survivorship bias, those that "failed at life", became homelessness/suicide(drugs etc), aren't here to reminisce with us all about the "simpler" times.