What Causes Vaginal Tear During Intercourse And Pain After?

I experience frequent but minor vaginal tearing after sex. It does result in pain initially during sex. After wards it is tender and there is a burning sensation while it heals. I ve seen doctors and haven t received any help. I m 41 years old. 127 pounds. 5 feet 6. This is causing a lot of issues with my marriage. I need to get things back on track.