I studied abroad in Wales and it was one of the best times of my life. I had a blast. And my GPA went up! I lived in a house with ten other people and I guessed they matched us based on surveys or something, but we were all "eccentric" and got along pretty well. I am still friends with several of them, years later. And the classes are nice and structered just like I prefere and they tell you what they want and they will help you if you ask for help too. Lots of free time to study and join clubs. And guys with accents!
One thing that helped in Britian, I felt, was that were certain social rules of politeness or whatever one calls it. Things like bus ques and all that (I miss bus ques). Anyway, if one can learn and adhere to these social rules- and they are fairly straightforward rules, mostly its learning how to be polite, then eccentricties seem more easily tolerated over there.
I would suggest working with people in study abroad before you go to learn about these rules and conventions and practice them. Also learn the different dialect things that help (like trousers versus pants, especially for those of us who do wear skirts- otherwise this can be embarrassing and funny), learn stores and places to shop and go to eat, etc. Learn as much about the culture and customs as you can before you go- watch the tv from that place and so forth if it helps. That way when you do get there it won't be so overwhelming. Plus the excuse of comming from another country is a great one for being socially akward! Use it!
Have fun!