I was running through an endless forest being chased by zombies and ran into a shelter made of doors
Dreams about being chased generally represent feelings of anxiety, fear, or avoidance. Zombies, in particular, often symbolize fears of death or the un-dead aspects of oneself, such as repressed emotions or unresolved feelings.
The fact that you ran into a shelter made of doors suggests that you are seeking safety or protection from these fears or anxieties, and that you may be actively trying to find a way to cope with them.
The endless forest may represent the unknown or the unexplored aspects of your psyche, while the shelter symbolizes your attempt to retreat or insulate yourself from those fears. However, the fact that it's made of doors suggests that you're not fully sealed off from those fears, and that you may need to confront them eventually.