I developed a rich social life simply by saying "yes" to (nearly) every opportunity I was asked.

It takes energy and commitment, just like anything else worthwhile in life. Have the courage to not be good at something, to do it anyway, and to keep doing it.

Many years ago, there weren't so many opportunities, have to make some of your own. (I began my adult life in the midst of the pandemic. I am very aware of how empty the world can feel.) Join clubs, large events, book clubs, art shows, these things exist, you can find them. You won't have many friends at first, but you'll meet a lot of people. I nearly took the LSAT for fun because at some point some kind-of-friends/acquaintances were preparing for law school. Take every opportunity, do anything, figure out what you like, and who you like.

Later on, there is simply not enough time in the day. You can wake up grateful every day that you can do whatever you wish. You will never want for a closer friend. There will always be some challenging adventure you can take. Or a comfortable evening with some close friends. Your friends will show up at your door with gifts, you will see the sunset from some mountain you climbed, you'll run through the rain with your friends and laugh, you'll be familiar with half the rooftops in whatever city you're near, you will have career and social opportunities just because of how many people you know.

And finally, you will have a responsibility to provide good prosocial opportunities for someone else who is figuring out the world.

It is possible.