Some people believe they have good luck and others believe they have bad luck.  They are both correct because what you believe has a significant, perhaps even profound, effect on the world you experience.  A person who thinks she is lucky will win more often than the average person.  A person who thinks he has bad luck will win less often than average.  
    Some try to explain this with the idea that these people are subconsciously doing things that either improves their odds of winning or decreases.  I can understand someone may be subconsciously doing things to sabotage his chances of winning but how do you subconsciously improve the odds?  Don't the experts tell us there is nothing you can do to improve the odds of winning or loosing because the selections are all random?  At least on games that don't involve skill like lottery tickets or slot machines.  The only way to improve the odds is to buy a lot of lottery tickets or play a lot of slot machines.  Yet the fact remains that without doing that, there are those people who regularly defy the odds one way or the other.
The science of quantum mechanics has demonstrated that what a person expects the outcome to be will increase the odds of that outcome happening.  In other words, what you believe affects what happens.