Here's a big thing that took me a long time and a move to Minnesota to figure out. You absolutely do not have to be inside all day in the winter.
I don't live in Minnesota anymore but geez, people went outside on the coldest of days. Ice skating, ice fishing, broomball, hockey, cross country skiing, snow shoeing, hiking, golf, walking. Going to coffee shops, going to museums, taking classes. As alcoholics I think we've trained ourselves to always see the worst, oh woe is me. There's so much out there that's fun and doesn't involve alcohol. Hang in there.