I've only been alive for about 21 of them.
Anyway, Dyslexia is a developmental reading disorder. It happens when people aren't proficient at a young age in reading, writing, and spelling. It's not some mysterious and ruthless disease that strikes random people, as you make it out to be. It can be overcome, and you don't have to absolutely master the english language to speak it well.
And frankly, I don't see the big difference between speaking and writing. Please explain that to me.
Though I do agree that English is illogical, I still maintain that, even if you haven't mastered it, it's still more than possible to become proficient in it.