[gusennan]

I just turned 35 and my situation is very similar to yours, with the exception being that I am married. Partners and family do give one's life a lot of meaning. That said, I'm glad you asked this question, as these topics have been occupying much of my thinking lately as well. I don't have the solution, but just want to let you know others feel the same as you (as you have probably already seen in the comments!)