I think making new friends can be so nerve wrecking but if you think of it in a more positive way - you only need to make 1 friend really then together you can mingle with other people. I think the ideas of joining clubs etc are far better than just going to a bar by yourself - you're more likely to make friends for life when you're sober + you'll have similar interests. Plus you'll undoubtedly make friends at work - why don't you see if people want to go for a drink post shift or something. Sure you'll be fine! Good luck