Why do I feel like the only post baby mommy with stretch marks on my stomach?

My mom and almost every woman ive seen who has had children have no stretch marks on their stomach or any noticeable ones. I’m only 19 and so embarrassed that my stomach looks like it got shredded by a tiger. I wish I could wear a bikini I feel so disgusting. I’m not even that big at all post pregnancy I’m 7 Months postpartum, but my stretch marks look horrific. Why do I feel like I’m the only one?