It’s not uncommon. Especially strokes affecting the non dominant side of the brain, people often don’t realize there’s anything wrong. Takes other people around you to tell to you that something is wrong.
You shouldn’t feel bad, it could happen to anyone. Just depends on where the stroke is in the brain if someone is capable of recognizing it themselves or not.
An especially difficult one for people to detect on their own is strokes that are affecting visual centers of the brain. People expect they’ll see black or something. But you don’t see anything at all, field of vision is just narrower. It’s like, you don’t see black out the back of your head normally right? Usually if people notice anything it’s that they’re bumping or tripping into stuff on one side, or like driving and get in a car accident because they’re not perceiving one half of what’s in front of them.