I have a metal roof and it's no louder than the shingle roof in my childhood home. I think the big difference vs your awning is that my roof is fully supported

I have a metal roof and it's no louder than the shingle roof in my childhood home. I think the big difference vs your awning is that my roof is fully supported by the home's sheathing and is screwed down in many places. This limits the opportunity for the metal to resonate.