What does "feeling like your life is over" mean and why is it not in any dictionary online?

Read also:

• What is your response when someone says "how may I help you"?
• What was your most embarrassing wardrobe malfunction in public?
• What are some sad truths about life?
• What can I do when I'm ugly on both outside and inside? What do I do? Cut myself off from the world to make everyones lives better? I'm a monster. I hurt feelings, and I say what was said to me. I feel like I'm nothing but a burden. What do I do?
• Why do some women alter their faces by so-called cosmetic surgeries (on their eyes, cheeks, lips, chin, jaw) that making them look like Donald Duck or puffy aliens, while for most men these unnatural facial changes are ridiculous or even disgusting?
• Why did Democrats echo that Joe Biden was greater than FDR and should be put on Mt Rushmore? Why did Democrats vote for Biden blindly in the primaries and deny he was mentally impaired? Was it the lying media, or are Democrats ignorant and gullible?
• Democrats be honest, how many of you were wishing that Musk rescue space flight blew up?
• Riddle: How do budget cuts, DEI hires, and empty reservoirs, turn the bluest, most Democrat city Red?
• What does it mean when someone leaves something in your house, your room to be exact, and when you tell them, they say they left it there on purpose?
• Why am I dreaming of people I've never seen before?
• The Simple Rule That Seems To Govern How Life Is Organized On Earth - IFLScience
• PoGO This Week (June 2-8): G-Max Rillaboom, Groudon Raids & GO Fest JC - Pokémon GO Hub