Hi Cynda and welcome to the forum. I think it's great that you're taking positive action and wish you all the best. I am going to give advise though, mainly because I have a compulsion to offer my opinion, but also because I've been in a place similar to you and I want you to know that there is a way out of it. I've lived here for nearly 14 years. It's a long time-a third of my life. I really feel that you need to look in your own community for friends. It sounds like you do have some resourses-where you volunteer, the club you belong to-where you can make friends. It's not going to be easy, you do have to put in a huge effort, but it can be done and is worth it in the end. I had to force myself to go out and try to make friends and it worked. I have friends I've known for years, I'm friendly with my neighbours, have aquaintences I say hi to, see people that I know when I'm in town or at tescos. And some of these friendships were the result of as simple a thing as taking the same bus on the same day every week and chatting at the bus stop.
Personally, I don't think it's a great idea to put so much effort into making only American friends. The first reason is simple but true-Expats tend to move on. Alot of American expats are here for a variety of different reasons but not very many are here permanently. You could put alot of effort into a relationship only to find that that person is moving back to the States and you've got to start over from scatch.
Another reason I would tend to avoid only US real life friends is that you may find the only thing you have in common is your nationality. I've had freinds in my area that were American, but I met through common interests (ok, my kids). Any Americans that I've been introduced to as 'here's another American', I haven't had anything in common with and did not build a friendship with.
I've made some good friends through this board, but that too is a result of having common interests, of taking the time to get to know them, and finding out what they're like through posts and occasional meetings.
I wish you all the best Cynda, and hope that you can make some lasting friendships here, just try to be open minded about where you're going to make them.