I understand how you feel, Joey. I started going through my "first" (hopefully not last) puberty when I was nine, and to this day, I still have ridiculaously dark stretch marks along my hips because they grew so fast.
I don't really think they're all that bad, although they are certainly annoying. The reason I'm not too upset with them is because stretch marks occur when your skin isn't growing at the same rate as your body, and because that happens to everyone, technically everyone should have stretch marks. If you have skin, it's not really avoidable.
I can't say anything about cocoa butter, to be honest. I've never used it long enough to see any improvements.
But, I do know that fresh, concentrated parsley oil does kinda help with stretch marks, as well as pimples (I literally had acne all over my face and arms, and within one day of using it, almost all of them went away), weird skin shades, and more stuff like that. i can't guarrantee it, because the kind I found was handmade by some guy in africa, and he doesn't list all of his ingredients. But I'm sure it'll do something for stretchmarks.