This is not a question for an assignment, rather a question I have. Can you have alzheimer's at a young age?

I am currently sixteen, and I have trouble remembering where I am and how I got there. I forget who people are very often. I started to take notes on everything I do in my daily journal, but sometimes I forget to write in my journal as well.

My mom did drugs when she was pregnant with me, but stopped after finding out about me. My great grandma also had alzheimer's and completely forgot how to speak coherently. I've suffered from ptsd and trauma from a young age due to problems with my home life.

At one point I forgot everything I ever even knew. For example, I forgot all of the people in my life and my relationship towards them. I forgot things academically, and failed many of my subjects because of it. My best friends who apparently knew me, but I couldn't recognize them. And even my own family.

Sometimes, distance from things is horrible for me. I am aware of my memory problems, I don't know what to describe it as. I can't recognize faces very well at all. I have been nose blind since the moment I was born, and my eyes are slowly getting worse and worse.

I thought I might be suffering from alzheimer's or some form of dementia or trauma induced memory problems, but I can't be sure.

If anyone can help me understand my situation, please contact me. I am tired of being in the dark.