Hi Dan
I understand what you mean. Something that has been helping me lately is concentrating less on 'me' and more on my family. I don't know if you have family or not but maybe some friends or something.
Anyway, I took my wife and children, grandchildren to the Aquarium last weekend and then out to eat. They had a lot of fun and even though it was not 'my thing' (I like video games) their enjoying it made me fill a bit more whole inside. At work, I have been actually trying to help people more insead of just 'doing my job' to get by. That has helped to.
I am new to doing this so I am no authority..but it has helped. After my best friend died recently it made me start thinking about the 'point' of our lives. If there is a Creator who cares, it may be very likely that our time here is a test in how we treat our fellow man and family. After I do those things for my wife, coworkers, and family and I am drained (I am an introvert who likes to be alone) then I made an agreement with my wife that I could play all the video games I want (: Balance, and giving back to others I think is what makes like worthwhile.