Another angle to consider:
When I as a DM use the background hooks of a certain character, I am, of necessity, making that character the focus of the campaign, or at least the focus of those sessions which involve that particular plot hook. i.e. if I decide that the bandits who stole Bob's sister have been sighted outside the city, then Bob becomes the lynchpin of the game for the time being. The lynchpin position often requires that the player be outgoing, be driving the action to a degree. And if a player
doesn't drive the action, then the session can fizzle.
I have a similar problem in my own campaign. I took a very nice plot hook from a character's background and tossed it into the game, but when the time came for that character's player to run with it, he stalled. At the same time the other players were intentionally letting the one player take the lead, because the plot hook at hand so intimately involved his character. Only he wasn't leading the group anywhere, so everything stalled.
Now, it may be that the DM of your campaign has gotten used to making "Jim" the focus, because he knows that Jim will drive the plot, whereas he doesn't have as much faith in the rest of you. Not the best situation, but not a hanging offense, either, for a DM who wants to run a smooth session.
In any case, the solution is to talk about it with the DM. Avoid confrontation, though, because it may not be that everything is his fault, and if you aren't careful, he'll believe that you're making an accusation.
Edit to comment on
As difficult as confrontations between friends can be, I believe one is needed here. Try keeping a civil, friendly tone, but make it perfectly clear that his DMing is frustating the entire group, with the possible exception of "Jim"...
I wouldn't recommend this at all. This kind of approach makes it seem like everything is the DMs fault, and that may not be the case at all. The players' playing is likely involved in the situation as well. I'd suggest something more along the lines of "some of us would like more focus on our characters' backgrounds. We like Jim's storylines, but we'd like some of our own as well." Request change, don't accuse him of being a bad DM.