I Have Black Marks All over my Body Since I Was 13 Now I'm 21. My Thighs, my Back, and Stomach. Any Suggestions? (photo)

I have black marks all over my body since i was 13 now i'm 21. The only spot in my body that doesn't have any black marks is my breast area and my face.I've been told it is because I have dry skin that's why the marks never goes away. I'm only 21 and i've never been at a beach with a simple bathing suit on and scared to be in a relationship cause of my skin condition. Any suggestions on what to use?

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