To dream of walls indicates that you have obstacles in your path. You options are somewhat limited. You, or some external force, are blocking your progress. This may be as simple as self-limitation due to relying on old patterns and ways of thinking.
When you dream of yourself jumping over a wall, it foreshadows a solution to your obstacles. You will soon remove the barrier in front of you.
When you dream that you have broken down a wall, it is a subconscious memory of a childhood trauma or an indication that a current relationship is souring. It may also be an indication that you have realized there are boundaries in your life and that you are comfortable with them.
When you see yourself hiding behind a wall, your subconscious is showing you that you are ashamed of yourself, your behaviors, or of friends or family.
If you are thrown at a wall, it is an indication that it is time to find a way to remove the walls that are limiting you. Consider finding a way to explore your surroundings and possible solutions to your waking life problems.