ATM as used in casual, everyday texting is most commonly short for "at the moment". It could also be used to mean "automatic teller machine", which you can use to get cash from a bank account.
"Lifes" is an incorrect spelling of the word "lives."
"Lives" is the plural form of "life," referring to the existence of multiple beings or the multiple experiences of existence.
"Realy" is an incorrect spelling of the word "really."
"Really" is an adverb used to emphasize the truth or extent of something, or to express sincerity or emphasis.
The phrase "sharing is caring" conveys the idea that sharing with others demonstrates kindness and compassion, and that by sharing, we show that we care about the well-being of others.