Welcome to the forums.
The rhythm in speech is something we absorb as we grow up. Your best plan of action is two-fold - keep a radio on [quietly] all the time you are doing anything or have spoken word recordings on; and if you have any good Canadian friends, ask them to point out your errors and then practice what they show you to be the right stresses.
It happens to all of us learning to speak another language as we instinctively use our native stress patterns.
It will come eventually.
- For Teachers