Hi there,
I'm sorry you are feeling scared and uncomfortable about going to this stag party. Is it a must that you go? I wouldn't go if I didn't feel comfortable, but there have been times where I thought I'd have a horrible time going somewhere and it turned out to be great fun in the end! I think it all depends on you as an individual. I would weigh the options and then go from there. Some people would probably suggest you go just to get out of your "comfort zone", but I think you should do what you feel. Whatever you choose, you have my support!
By the way, if you don't mind my asking, what does your wife suggest?
Sujin