Read the New Testament and then the Bhagavad Gita. Jesus's words are uplifting but there's a lot of information that he gave the disciples that didn't make it into the Book. The Gita can be viewed as the "missing manual".
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I just lost my cat recently and had a birthday, so I'm in a deeply existential mood.
"All things are impermanent." It's as true as true can be. One day the cat is here, fluffy and meowing. The next day the cat is gone, and unlike the one in the story the cat is not ever coming back. Everything is like this: temporary, transient, contingent, impermanent.
The only thing, if anything, that we can "take with us" or that outlasts us is the effect we had on the world around us while we were alive. That is the closest thing to a "possession" you'll ever have.
So look to that. If you seek meaning in life, try helping people. Be kind. Cherish every moment. Feel and express love.
Hope this helps. :)