Hello, I’m 12 years old, female, 165 pounds and with a height of 5’1. I’ve been gaining weight rapidly, but haven’t seen any results of weight gain. Instead I’m covered in red / purple stretch Marks from head to toe and from this age it’s sooo embarrasing. I have it on the back of my knees, lots on my arms, everywhere on my legs, thighs, but, everywhere. What do I do and what’s happening?