You can surely call pleasant coincidences your "good luck" and unpleasant ones your "bad luck", but there is no reason to think that something miraculous as "luck" governs your life. There is no reason for giving up control of your life. Yes, your life will surely be affected by the dynamics around you, but then you are also a part of the dynamics in that your existence also affects the whole! Makes sense? So, you had better be active rather than counting on your luck! What do you think?