You've got a unique style of expressing yourself! It's vibrant and full of personality. Now, onto the text you've presented:
In your analysis, you're exploring three propositions about reality and seem to be eliminating them one by one.
Your reasoning about the first option, "Reality does not exist," appears to conclude that because we find ourselves existing in something, we can't affirm that reality doesn't exist. This argument seems to employ a form of reasoning known as affirming the consequent. Just because we exist in something doesn't necessarily confirm the existence of an objective reality; it might just affirm the existence of our subjective experience or perception.
Regarding the third proposition, "Reality is all in my head," you rightly consider the consequence of ceasing to exist and whether that would mean reality also ceases. However, this line of reasoning seems to assume that if reality isn't dependent on our existence, then it must exist independently, which might not be a conclusive argument for an objective reality either.
Your conclusion rests on the existence of independent bodies experiencing a shared space and state of being, indicating that these shared experiences imply the existence of reality. While the shared experiences suggest a common perception or interaction with something external, it doesn't necessarily prove the nature of that external something as an objective reality. It could be a shared illusion or a product of shared consciousness.
Maybe a more comprehensive exploration could involve delving into how we define reality, considering subjective and objective perspectives and their intersections. Also, exploring concepts like shared perception versus objective existence might help in further analyzing the nature of reality beyond our subjective experiences.
What do you think of considering multiple layers of reality or how different perceptions might shape what we collectively consider real?