To dream that you are in parking lot, suggests that you need to slow down and take some time to relax from your daily activities.
To dream that you cannot find a parking space, indicates your inability to find your place in life. You may still be on your quest to find your talent or niche where you belong. Alternatively, it may reflect your busy life and the lack of time you have.
If you dream of a parking lot you must use all the aspects of your dream to determine its meaning, as the lot by itself, has little significance in and of itself. A dark and scary lot where you fear being mugged is usually a warning type dream and it could actually be a true dream, in as much as it may be telling you to stay away from dark parking lots or take extra care when one must be used.