Is it just me whose hairline is thinning at 17?

I feel so insecure I had such good hairs till age 15 but since last year my hairline has started thinning and I'm losing my self confidence. I doubt my parents would take me to a doc. I recently started using Rosemary oil but I don't know if that would help much. My hairs don't seem to be damaged, they're still soft even in the ends but I don't know why its still thinning...

Is it just me whose hairline is thinning at 17?
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