Can you get dementia at 20 years old?

I’ve always had problems remembering things, like I forgot where I put my phone or keys multiple times a day. Till I was 17, I had no clue how to get to school which was 20 mins away, even though we toke the same route twice a day since I was 5.

Now I can never remember doing the washing , and have to wash clothes twice because I leave them in the washing machine to long. I can’t remember what happened the day before or what I ate for dinner during the past week. Every single day, I’ll tell my partner something and he’ll tell me that I’ve already told him this before.

Is anyone like this to, or is it really as bad as I think?