Is it weird that i mix up some letters and sounds?

For instance when I'm writing, I'll have to stop and think if bee starts with a p or b. I also get my and by confused and put, out, and our.

As far as I know I'm not dyslexic, I'm twenty-three, and wear glasses. Could it just be in stresses out? I don't think this has always happened to me, at least, not this bad.