I agree with the first guest, the stretchmarkcure site is well worth a visit. If you go to www.stretchmarkcure.com/custff/141926.htm you can download the instructions for free.
I have been doing the programme for two months and I am seeing very good results. I have stretchmarks on my breasts, hips and thighs. I was very sceptical, but if you follow the programme regularly, it will help. My stretchmarks are more than 20 years old. The marks, especially on my breasts, seem to have filled in and look narrower. The skin on my body has become incredibly soft.
When you mix the scrub also add 1 big spoon full of wheatgerm oil. When using the scrub on your breasts, be very gentle. Apart from aloe vera and St Ives body lotion (if you can afford it, try L'oreal Stretchmark Corrector, it is excellent) I am also using rosehip oil. At first it sounds a bit complicated and time consuming, but once you get into a routine, it's not too bad.
You are still very young and stand a very good chance to improve the marks.
Best of luck!