In my humble opinion if you wish to quit the outside world and contain all of yourself inside, you need to figure out what makes you reach the state of being all by yourself but it must only revolve around perception (you can be in a loud crowd but still enter your inside, that is a mental ability I mean)
If you are all by yourself inside yourself and not distracted by anything that is outside of yourself you can begin meditating

I think what meditation is the natural process chain of what your mind does when it has nothing to analyse outside of yourself. It does not stop analysing despite there being nothing but you.

When nothing is to be analysed - your unconscious sees your memories, but you cannot see them.
Nonetheless it affects your string of conscious thought by the minimal leaks that get into your thought.
Thus your topics of meditation seem somewhat random because you cannot know what the subconscious is doing but the subconscious leaves you with little droplets from which you decide either to pursue or not with conscious thought, and the topics are limited to what you have seen and known.
Your subconscious, when no outside needs any analysis, turns into a regenerating and resting mode when it flashes (you cannot see it) through your memories and assigns to them how it will make you react in the future to make your decisions more effective, benefitial and faster. That is why you sometimes need to make a decision after sleeping with the problem - that is precisely after your subconscious part deeply thought about it for you through the entire night, to guide you with a gut feel (which are the leaking droplets from her) that lead you to a final decision which usually turns out to be the best.
It is subconscious who gets you familiar with whatever she is sorting out and optimizing for you. That is what subconscious does in your sleep, but during sleep it sometimes allows you to see images that are created from things it analyses and builds associations about at the current moment. Meditation is somewhat similar to sleep in that regard, but unlike sleep you are in full control and the conscious part is awake and able to override the invisible randomness of the subconscious. Nightmares is what your subconscious does for you during night for your protection, to remind you of what to avoid, she is very cute, subconscious is submissive and ellusive but she is your best company and best friend. I'm not quite sure how it works yet. She seems to make you more stati