being the only christian in family

I think you really need to make sure to have fellowship with other believers. I cannot imagine the difficulty it is to live with a family of unbelievers, I myself grew up in a very strong Christian family and yet I still struggle. Surround yourself with fellow Christians, and be a living example of what Christ is and what He can do in your life. Also, pray...a lot.

Try visiting amazingbible.org for some dynamic information for many of todays problem.