If there's no "self" then why should I care about the future lives and nirvana?

English is my second language. If there's no "self', and "I am" is just a "flow" or "mix" of information (dharma, karma, etc.); and if, when I die, "I" (body, illusory self, soul) will die but this informational flow will keep going into another being, and then I no longer exist, think, feel or I will be different being, so this being will be living but not me, then **why should I care** about his life if I will no longer exist? Or is it that there is a some kind of eternal selfless "self", the "watcher", that experiences this (and the next) existence and can think, feel? How does this "informational flow" ("soul"), a conglomerate of functions, get into someone's body? Is nirvana an "informational" suicide? In short, please tell me, why should I care about the next "life" or "going to nirvana" if there's no self, no core and "I", "myself" will disappear after death? Maybe I would stop caring about it because "I" will stop being exist and I will stop feel, think, care straight after death? --- PS: And if the reincarnation is like an ocean water been poured into glasses and back, and there's no core self and individuality is just a mix of informational patters, then maybe it's pointless to try to stop existance, to go to nirvana, because someone will always remain here. And if this Samsara is eternal then there can be eternal number of Buddhas, beings and they will be trying to get out of this Samsara eternally, then all their actions are pointless. Thanks.