Is it weird if a girl has pubic hair all the way till the buttcrack?

No not at all there will be many cases of this out there, even in men but mainly in women - it is your body protecting your vagina pubic hair is for genital protection.

It's not weird, but if the hair seems unpleasant to you it can be removed. There are gentle methods for removing hair from these body parts - by bikini waxing or sugar removal - with a paste warmed like wax then removed with a special cloth - called sugaring.