you have bought yourself an action cam that its biggest selling point is its wide angle lens.
If you wanted waterproof cam that does not have fisheye lens you could have gone for sony rx0 II or Olympus TG-6 , both pretty amazing cameras that take nice photos and good video. Nowadays you can find different cams to suit your needs
Gopro Hero 7 Black
Gopro Hero 3 Black
Previously: Gopro Hero 5 Black / Gopro Hero 3+ Silver / Feiyu G5 gimbal / Xiaomi Mijia 4k