Nostalgia mixed with the bitterness of growing up, of suffering, of knowing pain and trying to survive. The heartbreaking part is when you mentioned a specific date. I have that too, dates I remember where it seems harder. Harder to hold on to those moments of purity we remember. When we knew simple joy, when our fears didn't seem so big and demanding. When reality didn't throw us aside, when life treated us well and respected our innocence.

Also, wanted to say welcome to this site. Keep writing, will have to read more of your work on here.