I have dark stretch marks...?

Hi, I've always had stretch marks, but they became visibly worse. I have very pale skin, and they are a pinkish purple color and are slightly more sunken in than raised. I looked up results of Bio Oil because I want to start getting rid of them so when I wear a bathing suit they don't show. However, bio oil only seems to help with the stretch marks that are a lighter color and are smaller in size. I'm not sure how well coco butter will work. Is there anything i can do to help reduce the amount and color? Thank you so much, I'm so self-conscious!