Stretch marks:(((((

Right so I've have stretch marks on my bum and the tops of my legs for as long as I can remember. And let's be honest, they aren't the most prettiest things. They make me kind of insecure and I've used bio oil and stuff like that to try and get rid of them but they don't seem to be fading. 
So, does anyone have any tips or tricks on how to get rid of them?:)))