In your experience, the time is running out. For me to say you've got forty years to make friends like that doesn't matter,. In this moment, i've an opportunity to spend time with one person and i'm going to make the most of to day. And interestingly enough, when you start not worrying about whether this person will be available to morrow, a week from now, a month from now - then all these thoughts come bubbling up. The core thing is still, when you sit with someone, they can't fix all those problems for you. You'll learn how to be alone. But i really hope that you don't have a life where you're forced to