I think having luck and not having luck is all in your mind, just like most other superstitions.
If you are constantly looking for good or bad luck you will find it in any way possible. OMG!! I got a string of green lights! What luck. No. You're timing with the lights happened to coincide well. That's not luck, it's life.
Conversely: OMG! I stubbed my toe, my hair looks like s**t, I broke out, I'm out of money, and my tank's almost empty!!! May I refer to the phrase "s**t happens." Seriously. Get over it. You don't have bad luck. You're not special. You're human. Unfortunately, we all have that fleshy flaw!!
haha. Does what I'm saying make sense? I hope I explained it well.