I am treated like an idiot?

I'm treated like an idiot all the time. Fortunately not from my family, but often from my friends, classmates and some teachers.
I am usually someone who is forgetful and sometimes cannot keep up with some things. Whenever I ask a short question, I get a whole speech of explanation from my friends, although I understand the big picture and only have to understand a few small things, they often get frustrated with me and explain everything to me from the beginning like I need and it's very annoying. No matter what I do, I'm always treated that way and it's never enough. This is really exhausting because I know I'm not stupid, but when you get treated like that by others, at some point you think the opposite.
I am treated like an idiot?
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