I'm not a fake pilot, I'm a retired one - but oddly enough I partly agree with Fake's analysis. Dyslexia shouldn't be too much of a problem as nearly all exams are "tick the right box". I agree that MSFS can be used very effectively to practice the sort of in-flight maths required in flying.
My reservation would be this: If you are paying your own way then can you afford the "persistence" that FakePilot speaks of? Time is very much money in this case. If you get your licences OK, then you have to convert to a commercial type. Companies run conversion courses for their aircraft types and cannot afford for this to take too long. If your maths difficulties would really slow you down here it may be better to limit your ambitions to PPL.
But you mention your motivation. If that's strong enough it will overcome all your difficulties. I know that because I've seen it so many times.
Best of Luck.