stphnmc,
Hello friend,
(Excuse my poor English)
I had the same trouble. My way to win, was.
1-Begin to practice another strum, and repeat and repeat the structure, the movements, altough they soun bad, and altough You do it very slow, it doesn't matter, but, do the structure the right way. 1 or 2 days later, it will sound better, and the speed will be better.
2-Practice without guitar, and practice mentally, in every place.
You will surprised the progress
I You will reply this post.
Good bye