I didn't think you were lying about your age - I simply didn't catch the part where you stated it.
I don't think we should automatically assume they are racist (although they could be, of course). I understand parents who worry about their child's well being in an interfaith/interracial/inter-whatever relationship. People have been known to commit acts of violence against those considered "outsiders". Not everyone is strong enough psychologically to handle the stress.
Anyway, I think lying to your parents is very childish. If you really ARE 19, why don't you act like you are an adult and be straight up with them? And while you are at it, why don't you spell "girl" correctly to enhance our perception of your maturity?
Relax... I'll need some information first. Just the basic facts - can you show me where it hurts?