You could spread out scenes that are flashbacks throughout the story, (Without the damned cliche monologues.) or write your story Y - The Last Man style.
I think a lot of novice writers feel compelled to explain everything about their worlds and characters to their readers, which is only natural, because you want people to appreciate your work. There's just one problem. Readers DON'T GIVE A FUCK.
Readers don't want exposition; they want action, character interaction, romance, etc;
Any good writer will tell you to always start In Media Res. (In the middle of things)
What you should set out to accomplish first, is hook your reader. Once the reader cares about your story and characters, then you can go back and do any neccessary explaining. As long as you do it carefully.
Also, it's much better to show, not tell. For an example of what I'm talking about, read the story by Phil Craven in volume three of Flight.