C section can't have it natural

Erica
First pregnancy don't really know a lot I'm 16 weeks and 5 days today hopefully I get to see if it's a boy or a girl. And I want to have a C section because I have always had problems with my body especially my chest I can't lift push or carry anything heavy or my chest will get inflamed and I can't breath how do I tell the doctor that I want a C section nicely so she can accept that I want it?.