Girls...need as much help as I can get...jeans problem?

So i was in school today, and I was wearing a pair of hollister laguna skinny jeans. I love hollister, but these jeans were seriously unreal. They were so tight, and I know tight jeans lol. Plus, the crotch was tiny and there was so little space between the bottom of the crotch and the waist band (Low rise, I know, but this was extreme). And, most annoying, I had to keep pulling them up and holding a hand back there to keep them up and it was embarring and I was so embarred walking around like that and having to pull them up while sitting down. Note that I'VE TRIED WEARING A BELT and A SMALLER SIZE IS IMPOSSIBLE TO GET UP THE LEGS. Why do i constantly need to pull them up even though there like skintight on the legs and, like, a second skin?