Your brain stores everything you have ever seen or experienced. These memories are all stored there and when you dream your mind creates narratives from all your life experiences, ideas, emotions, and memories. For many people they dream about something they were recently thinking about or experienced, but for the most part your brain creates random narratives from your memories. This is normal and they have no universal or deeper meaning. Your brain is one of the most complex engines that exists. Random dreams are part of the normal lifecycle of REM sleep.
You're reading too much into what you're experiencing. Just because you cannot recall memories or experiences while you are conscious does not mean they are not all still stored in your brain.