Sing me something soft, sad and delicate, or loud and out of key... sing me anything

So in no time it'll be Christmas again.
That holiday always seems to sneak up on me. When I least expect it, it's just right in front of me and I have to deal with it. It's been almost 3 years now; well, 3 years on December 10th.
Part of me is angry at, well, myself... for not being over it. I don't want to be a downer or anything, but it seems like every year my mood starts taking a nosedive around this time.
The other part of me is guilty for trying to forget. If I try to move past these feelings, does it mean I'm forgetting my mom? I know that everyone will argue that it's not the same thing and they'll use those cliche lines about her always being in my heart and being happy that I'm moving on. Now that's all well and good, but it's not that easy. My mom was this amazing ray of sunshine in everyone's lives, and I want to be that for everyone as well; I want to throw big christmas parties, and wear jingling earrings and play christmas music from november through til april... but what if that means I'm not moving on? If I'm trying to be her? What if I'm nothing like her at all? What if all we share are matching smiles and vertical-impairment? I mean, I don't have her gorgeous singing voice, I don't have her tenderness, I don't have the same thirst for life that she always seemed to be overflowing with.
It seems so backwards that 4 christmas' ago she was overflowing with life and now she's... not.