How do I get rid of the line underneath my eyelid? (Photo)

What is it? What is it caused by? How can I correct it? I am twenty years old, and I am unsure how long I've had it it's been more than a year though. I've always had problems with my eyes, they're always itchy and burning especially around night time. I feel like the line takes away my confidence because I look at others and they don't have it. So I'm just curious to learn more about it and to find a solution. Thank you!

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