The astral energy body can feel physical sometimes especially when still close to the physical body or in particular dimensions. Your room will definitely look different. I think you AP'd which is great but just didn't make it very far. It sounds like you didn't have an exit plan for success. That would be meditating in advance and incorporating reality checks about a target location outside. You did recognize the door as an exit even though it was dark which is great.
Dark does not equal negative in the astral unless you get weird feelings/vibes with the visual etc. Try focusing on somewhere outside a ways beyond your backyard and up high like the top of a tall tree or over a lake/ocean/river (this only if you like water.) Make it somewhere you'd like being high up over flying, sitting or standing.
All in all.... CONGRATULATIONS! You Astral Projected! :-)