Too much holiday turkey?
Honestly you need separate gear for winter riding to really be comfortable. My winter jacket has enough room to accommodate layers and straps that allow adjustment so the armour is in the right place. I have about 4 different ways to gear up depending on temp. From just the heavy jacket and Dainese Gore-tex gloves with merino liners to full on heated glove liners, balaclava, heated vest and merino long johns with heavy merino wool socks. A wool skull cap under the helmet also helps without the hassle (fogging) of a balaclava. I can and have ridden in up to about -15 C and been comfortable.
Now as far as being nervous, I can't help you there. It does depend on where you are of course. While it can get cold here Toronto doesn't get a lot of snow. I'll skip riding for a few days after a good snow just to give things time to dry up and with the insane amount of traffic the roads clear up fast. I won't lie, I have hit ice though only small patches and then it's a matter of waiting to hit dry pavement.
There are stupid drivers out year round, pretty sure they don't take time off

Uber and Lyft have certainly added to the fun... I have been cut off by drivers for both services more than once as they pick up their fare.
If you don't want to ride in the winter I totally get it. I think there are maybe only 3 of us on MV that do it on a regular basis. In my area there are only 2 of us that park near my office regularly. Me and one guy with a GTS that has muffs on his scoot. On the roads near me I recognize about 4 other riders that do it and this is in a city of millions with free parking for motorcycles.