Are you dressing appropriately to keep warm? Keep your throat covered. If possible, try not to breath through you mouth. I'm not sure how cold it gets there (I'm west of Glacier National Park and when I see Texas winter-time temps they look down right tropical to me) but you could give some thoughts to wearing a balaclava on really cold days. Most importantly, if you really don't feel like riding in the winter, don't beat yourself up. Winter riding is not for everyone.