Mild Dyslexia

I'm in 11th grade, and I've never had problems understanding or reading. I recently (within months) to mix the letters that I write, and reading became more difficult to both understand and visually "see". When writing, I mix of letters like p, b and d, or I just mix the letters in words.

Is this normal if [going to write mix-up] ~ 10x / day?

If not, could it be an extremely mild form of dyslexia?

If you have never had this problem before, you should ask your parents to take you to the doctor to be examined. I do not suddenly comes dyslexia. It could be that you need glasses. An MRI or CT scans will identify the problem, but do not ignore it. It could be something simple that the doctor can treat.