Really bad date/months remembering issues
I'm 14M (almost 15), and, for some reason, I can't remember NOTHING related to dates. Like I can't remember basics of basics, even if I try very hard. I can't remember months, I can remember like half of their names but I can't remember how they go. I'm really ashamed if that but I can't do anything, I tried 5 times remember months and still failing it. Before history lessons I can remember 3-5 dates for like an hour or less, then, I forget it. It's not quite hard for me remember the exact year though (if it's more than ~1960). I have no idea why this happens. Can someone please help me with that ?? (My mom has similar problem, she can't remember the days the month has so she always uses her hands to count it and she said that she had problems learning months too, but she did it, IDK about my dad though)
If it changes something: I'm 14.5 yr old male teenager that lives in Ukraine, I don't do any substances (tobacoo and alcohol are no-no too), had smoked for some times and had already tried beer a couple of times. I think I may have depression and OSDD (although, self-diagosed). I had problem for like... ALL of my life.