how did everyone memorized fast?

Can you think up a song or put your notes in story form. Otherwise you just need more practice break things down with flashcards. Don't give up, it's hard I know but you [i]can[/i] do hard things. :)

But, to give you some tips: exercise between studying, but only aerobic exercises. Like study for three hours, then go for a run, that kind of thing. Also, when you really want to memorize something, drink caffeine, although have in mind this doesn't work if you already drink caffeine regularly. Some people also say chocolate helps.

It's okay, you just need more time and extra practice. It's not your duty to just memorize, though. In the end critical thinking is what matters. Many people memorize easily but lack critical thinking.

I've always been like that. Well after a week or two the knowledge I had been trying to memorize comes to the forefront of my brain. Then slowly disappears again.

Do you have any psychological issues? Disorders? If not, then perhaps you simply didnt care enough, didnt find it fun, or need more practice than others.