sorry you're feeling like this...

i don't actually know of any isolation sites, but posting here is a good start

i think that maybe you should take it in small steps- ask yourself.. well what is the main reason i isolate?

what could be the worst reaction i can get from people?

then talk to someone... maybe your partner you mentioned- it will be hard to do, but a great start

once she's listened and understood, she could help you as well build your confidence and get you talking to more people