Where on earth would you get that idea? I’m Catholic, of course I believe in “the afterlife”. Do you read the Catechism? It might help you. I’ve already posted some paragraphs which show that Jesus inaugurated the Kingdom of God on earth. But heaven, that place we aspire to go after we die, is separate. It is where God may be seen in all His glory. Nothing unclean shall enter according to the scripture. It is a place of complete purity. Obviously, that is not on earth-- at least not right now. But God has lowered Himself, even so much as emptying Himself to become man, so that He can reach out to His people. He established His Kingdom on earth so that He could draw mankind to Himself.
From the Catechism:
2795 The symbol of the heavens refers us back to the mystery of the covenant we are living when we pray to our Father. He is in heaven, his dwelling place; the Father’s house is our homeland. Sin has exiled us from the land of the covenant, but conversion of heart enables us to return to the Father, to heaven. In Christ, then, heaven and earth are reconciled, for the Son alone “descended from heaven” and causes us to ascend there with him, by his Cross, Resurrection, and Ascension.
1024 This perfect life with the Most Holy Trinity - this communion of life and love with the Trinity, with the Virgin Mary, the angels and all the blessed - is called “heaven.” Heaven is the ultimate end and fulfillment of the deepest human longings, the state of supreme, definitive happiness.
Paragraphs 1023-1029 have more info.