That's a lot harder than it sounds. Why be chipper and fun to be around when it feels (dramatically) like the entire world is against you. Why not just lay in bed all day, binge on potato chips, and watch Say Yes to The Dress until life decides to stop smacking you around?
Why not save the upbeat campfire songs for summer? I have never been a winter person, not even as a little kid. My earliest memories of winter are probably from when I was five years old. The heating being crappy in my house, being sick in bed 24/7 due to unrecognized cat allergies in a house full of cats, and my mother makings me wear ugly sweats to keep toasty.
I grew up dreading winter with every fiber of my being. It's cold, it's depressing, and I hate it with every fiber of my being. Screw gift giving holidays, they don't make up for it in my mind.
I'm just in a very low-self esteemed, insecure, chilly place right now and I just want to curl up in my bed and cease to exist until things are better.