Why is it so difficult to make genuine friends these days?

I feel like nowadays most people only consider you to be a friend if you can do something for them….
People no longer just want to have someone to talk about life and share their problems..
I feel like alot of people only consider you to be a friend if they can get something out of you… they are not really interested in you the individual..
They seem to only be out for a fun time and if you can’t introduce them to the next party or fun time or have something to give them like a free room when they want to go on holiday where you live then they don’t want to be friends with you.

Or they only do things for you because they want to get something out of you later..
Why have so many people become so shallow and selfcentered ?