If you get stretch marks does that mean your getting fatter?

okay im 14 and weigh 160 ish i havent weighed myself in months so the last time it was that but im not like completely obese but i dont find myself skinny and on the inside of my legs im getting stretch marks but im not gaining weight atleast no one told me and i dont see it so i havnt gained weight and there going to my waist lke the bottom of my stomach and my upper legs like at the way way top does this mean im getting fatter??!?!?!? and how can you get them to be less noticablee?? please read soooon also does any one have any ideas about how to lose lke 10 pouunds within like a month or two cuz i really wanna lose weight for summer but idk thats not really important.