balmerhon, you bring up some great points...I for one didn't even begin to feel adjusted until I actually met face-to-face some Americans. I don't know why that made a huge difference, my husband was always very supportive and understanding. But I felt no one understood me. And event hough one of the first persons I ever met was from 5,000 miles from where I was from, I still felt "finally! someone I can talk to!"
Jen, there are loads of Americans in Oxford, but a lot of them are linked with the university. A couple belong to the OXMacUG (Oxford Mac Users Group) and anyone with an interst in Mac computers can join...they just meet in Oxford. that's just one example.
I know well from past experience that no one was going to come up to me and ask to be my friend. So I forced myself to do things that were 'normal life'. I went to the gym (guess what...there's an American who goes there!), I got my nails done, legs waxed. Then I volunteered for the local village newsletter...talk about meeting folks!
I know it's hard to get out there when you just want to hide the fact you even have an American accent, but it's going to take that first step. Get out, go to the local butchers once a week (I guarantee after three visits, you'll be remembered and greeted the next time!). Do business locally and be seen out by these people...a great feeling of satisfaction when people start recognizing you and wave to you across the street. Start chatting with the person behind you in the checkout line (that happened to me today!)
There are ways to make friends. I found my own confidence by meeting other Americans, who confirmed I wasn't nuts, then that gave me the will to take the next step of getting involved in my local community.