I'm sorry to hear that darkeyed
a few things I can suggest
= use facebook to reach out to some people who are on there who can understand and support you (use your friends list to build a list of people you trust, then use your privacy settings to manage who can see your posts/statuses)
= start an anonymous blog about living in fear/hiding as an ex-muslim (blogspot.com and wordpress.com are 2 popular sites for setting up free, anonymous blogs - just use a free, anonymous email address). This will help you vent, and who knows, it may even inspire some others who are in the same position and you could end up making some friends this way.
= go outside and join a group/team or volunteer your time at a shelter or non-profit that you like, I'm sure there are some things like that out there. That way, you'll be helping others which will make you feel good, and you'll have a perfect and noble excuse for getting away from your relatives.
= spend time at the library or bookstore, read up on topics you like and others you never thought of reading up on before. This is always a good idea but especially when you're cooped up at home with people who're getting on your nerves.
= talk on the phone with people from here or others who are in a similar place as you or who can understand what you're going through.
Just remember, this is temporary, don't let this situation break you, hon'.