I think this poem is about being born into a world that at first seems loving and comforting. But as the protagonist gets older and experiences the world outside of their bubble, they see that they aren't special and nobody pays them any heed. Not only that, everyone ignores each other and don't treat one another with any significance. This causes the protagonist to seek out others that feel isolated and unloved. However, the protagonist actually starts loving and caring about all of these other lonely people. The love becomes infectious and spreads through the world. The protagonist can close their eyes and die happy knowing they brought happiness to future generations.