I can't understand how older permanently single people cope with that

I'm a 27 years old woman, and permanently single. It's about three years that I feel a void in my heart, I wake up every morning with a heavy feeling of hopelessness, I feel so demoralized whenever I see a couple outside or hear about someone getting engaged, I can't imagine living like that for an other decade or two, all lonely without even memories of holding hands or hearing sweet words. And honestly, the bitterness grows on me, catching me asking myself and the world why not me?

Then I see involuntary single people in their 40s and 50s, all lively and energetic, doing their daily duties every day with great enthusiasm, joking around with friends holding long term platonic relationships and being passionate about their lives. I on the other hand I don't see meaning in life without romantic love and without having the privilege of making a family of my own, and I wonder how will I even be motivated to cook my breakfast if I never experienced love.