Potential memory problems?

I am 20M and the only time i can recall drawing anything is in art class at school. I never pursued art or was interested in it.
I was playing a D&D game with some friends, when the DM asked us to draw our characters. None of us knew how to draw, but my drawing turned out by far the most proportionally correct and genuinely quite good, probably because i had drawn a full body sketch before doing lines. The others were genuinely impressed with my skill and I chalked it up to having watched some youtube tutorial or something.
Fast forward a few months and while clearing out my room I discovered 4 notebooks completely full of drawings, mostly practice of anime style characters, you could clearly see someone's progression in skill. I know I own these notebooks and I have never given them out to anyone, but I always thought they were just full of my notes. I absolutely do not remember drawing in them, ever. I can recognize some anime characters from an anime I was watching at the start of quarantine, so when I was about 14-15. I can swear I didn't draw them but I cant think of another explanation. There are a LOT of drawings also, had to be done over months at least. Could I have completely lost my memory of this?

I'm still not sure if those are mine but can memory loss manifest like this? I don't have any other diagnosed problems.
Should i see a doctor or psychiatrist about this?

p.s I am an only child and a sibling could not have done this.