Is it normal that my memory is bad?

I'm really good at understanding things when I'm learning about them, but I forget very quickly
One example is in history. I did extremely well in US History and I knew everything down to the little details as I was learning it. But now I barely remember any of it and its only been a year! I understand that I wont be able to remember every detail but I can't even remember things about the last thing I learned last year. It happens in other subjects too but history is really important to me beause I'm studying political science in college and Im really interested in history.
It's also things outside of school, like I can't remember what happens in movies like a month or so after seeing them, even if ive seen them numerous times.
sometimes I can't even remember things that happened to me a couple years ago. Like I couldnt remember that I ran cross country my first two years of high school(im a senior). I knew I ran xc I just couldnt remember for how long.
It's just more annoying than anything.
IIN? and is there any way to help me remember things?