How do I know I am a true Christian?

I have been worrying a lot lately about the end of the world and I was just wondering how do I know I won't get left behind? I believe in God, I pray, I am saved, I have even tried getting someone to be a christian. I just don't feel like it's enough to be with Jesus when he comes. I also have never read my bible, does that mean I will go to hell?

K,
Mississippi

Please read:
Tracie Putnam's response Part 1
Tracie Putnam's response Part 2
Tammy Childers' response

Pray that I make the correct discisions!

I have recently been given the responsibility of taking care of my 17 year old niece. I am scared to death that I will make a mistake with all the descisions that I must make. I need to know that others are praying for me. She was raised in a home much different than my home. The sitution is so different she seems to be happy here but i want her to come to know Jesus in a real relationship. Please pray that she will come to know Jesus in a personal relationship.