Self is not one thing, but a coalition of different things. Different components may dominate at different times; for instance if I am tired, inspired, upset, or in a state of flow.
I can choose to act from different parts of myself, and to nurture particular parts.
It's not great policy to apply weed-killer to the nasty bits. They fight back. Weeds can be given space to exist. At best they'll flower (oh what an extended metaphor) and at worst at least they'll be integrated rather than pulling the strings from behind my back.
Self isn't even inside my physical body.
My mind loops out via symbolic technologies, or simply my audible voice. What I mean is: I can relate to my own thoughts in certain ways via symbolic representation that are impossible without them. I write down some thoughts on a page, draw arrows, mash things up, reorder them. The page is part of my brain. I'm a cyborg.
Social roles mean my self isn't even separate from other people's selves. Mirror neurons inside of me fire equally when I observe another's actions as when I perform the same action myself. And who would I be without anybody, except a nobody?
My DNA is 99.9% the same as other people. On what basis am I not them and they are not me? On close observation they seem to tick very similarly to the way I tick.
It's clever how we have collective nouns for this sort of thing. Not me, the person, but us, the family, community, nation, species.
I can differentiate myself from other people, but whether I conform, or rebel, or act mad-capped, or commit acts of violence, or whatever I do, I'll still be very similar to what countless others have done. I can be any note on the piano I want to be, but whatever note that is, it's going to be on the piano.