We are lucky because now we can write down that history for our descendants in not only an accurate way but also using our creativity to make it beautiful too. Don't ever estimate the importance of scrapbooking. Preserving the memories of your family is one of the best gifts you'll ever give them. Don't worry if you are "behind" or if your pages aren't quite perfect. Don't be concerned about not having the right embellishment or that you can't remember the exact date the photo was taken. Those trivial items won't even be noticed by the generations after you. What they will notice is that you took the time to share your life and the lives of your family members in a way that would last for years. They'll notice that you cared enough to make sure that they would know who you and your family were, how you lived, what you ate, how you played.
No matter how much or how few pages you've done so far, pat yourself on the back and KNOW that it' so much more than a hobby, you are truly capturing memories.