My current DM in their homebrew campaign has centered the campaign almost entirely around the barbarian in the party. The campaign has been going for about 6 months of play roughly once a week (about 6 weeks of in-fiction time at a guess). I joined later than the rest of the group though and I created my character and backstory then with the DM's help.
For clarity, the party's adventures are related to getting the barbarian's "dragon powers" back by proving him worthy of having them. His backstory is pretty much that he was true polymorhped into a human by a powerful wizard to teach him a lesson.
The reason this is annoying (or however you would prefer to interpret it), is that the DM actually specifically requested backstories from everyone but hasn't seemed to actually take any note of any other character's backstory. It seems so far that I could have pretty much written anything I wanted in the backstory and it wouldn't have mattered because they would ignore it anyway. (I did write a backstory that I felt was quite good.)
I'm not sure how to handle this type of "problem" and the fact that another player has felt the same way kind of worries me for where the game will go if this continues.