Negative thoughts bring you no luck

Well, my friend told me that negative thoughts bring you no luck. Is this true? Well my friend experienced two times of bad luck. As her mind full of negative thoughts and she told me she got the chance to use keys 3 times each time at two locations.

She told me that both times also she failed to open any up. No kidding. My other friend has better chance of winning and strikes all three. As she is very positive thinking, love friendship with positive people.