Not a therapist or anything but maybe you should change something in your life. Don't get me wrong, I'm not trying to say that your life sucks but I'm pretty sure you lack variety in your life. Like when I went to uni after a long time of self-isolation, I was genuinely happy because I was meeting new people, socializing, studying etc. Maybe you're just bored of routine and of your old ways of doing things
maybe 4-5y ago or something to be honest, when i got a good pc and started on csgo watching LG-SK and going out with friends sometimes before i started uni.
After that i just been going foward with life.
This is normal for finland
+1 after the 14th year I've never felt like u described :/
i cant really remember any memorable or happy moment
everything has been just, forgettable i guess