How do I get rid of the thing they call a “c section line?” I want a flat stomach?

No, I have never had a c section before, and have never given birth. I always thought that this line was from where my pants sit on me, but I’ve noticed that not all girls have this line below the belly button a tad. It makes me sort of self-conscious when I know I shouldn’t be. On the lines that it looks like I way more than I do. Any help would be much appreciated.