I get what you mean.

Our own intention is to make friends and ultimately have a long-lasting, meaningful human connection that give each other something we're seeking. However, other people's intention there, is usually to do things or co-mingle with their existing circle instead of making new friends or meeting with strangers. That difference in intention makes it hard to make friends, even more so if there's a prior personal difficulty in social interaction.

For a long time, I thought I am okay as an introvert being on my own but I soon realize I still need someone who I can do things together with, experience new thing together, share something together, to suffer together, or at least, to have someone I can rely on or be there for.

Still, I can totally agree with finding it very difficult to meet or make new friends irl. Nowadays, nearly everyone is on their phone, frequently distracted and don't have much effort, energy, time and attention with each other. I can imagine people getting old, talking and doing with lots of people but at the end of the day, still feeling very isolated, lonely, unheard, feeling like no one cares about them and not having anyone they can depend on or ask for help.