Exercise trouble!!

Exercise is one of my greatest aspect in life. I love the feeling and I love the result. It's one thing I do love to do more than anything. I exercise to make myself happy and make my body healthy. But with great result comes great consequences😞. I have these stretch marks along the side of my leg and they are kinda dark. Not a lot of them but a few. One thing to a women beauty is their skin of course. They are fading but it is taking time to go away and taking time off of my workout routine. I need help please. What did I do wrong to get these devil stretch mark that is dark? How can I get rid of it? Will I be able to workout again?