If you are the only being in the world, then what makes your life hard? It is quite reasonable for there to be another part of yourself that hates you. But then, what is the distinction between that other part of yourself and another being? If there is just more of you, at odds with itself, how do you consider yourself to be a single being with a single agenda. But if you are a single being with multiple agenda, then what does that mean?
Ken Wilber, a trans-Jungian theorist who integrates Eastern and Western philosophical traditions into an "integrationist" therapeutic model, points out that these distinctions between single and multiple beings, single and multiple agenda are each sometimes true and sometimes false.
At different levels of aggregation and abstraction, we are all one organism, or we are different species of organisms, or we are different societies of organisms, or we are different families of organisms, or we are simply different individual organisms, or we are a body and a mind, or we are multiple minds despite our identified physical boundary, or we are multiple minds working across multiple identifiable physical boundaries, or... Identity, and with it various related processes of homeostasis, goes all the way up at least to the planet, and all the way down to the folded proteins that power the multiple different kinds of organelles within each cell.
Daniel Dennett is a bit obsessed with the notion that the separate cells of your body were evolved to survive independently and to compete with one another, but they are bound together against their potentially divergent wills to participate in your overall conscious process. This is parallel to the way microbiology points out that the organelles that exist in our cytoplasm, which make individual cells work, like mitochondria and Golgi bodies, originate as separate prokaryotic species with very divergent agendas, and are enslaved in a way by the nucleus as a resident overlord.
So it seems silly to answer the question. It can only limit our insight. And it is almost certain to be wrong at least some of the time. If this is all me, it is still all here, in competition and collaboration with itself. If it is not all me, there is a greater me of which it is all part, but there are also sources of agenda outside me. Identifying with different layers of it is productive at different times. That makes what is 'external' a matter of circumstance, and renders this a meaningless question.