Hey somasucks, people have delegated birthday reminders to Facebook nowadays so I wouldn't take that very seriously. If not for Facebook, I wouldn't remember my best friend's birthday even.

I think what you're feeling is ennui maybe? This odd feeling of dissatisfaction even though life is good on paper. This is something I feel too, and oddly enough, I know what to do to get myself out of such a situation. Meet more people, talk to the people I know more often etc. But I fall into the exact rut that you mentioned in your post - I come back from home not tired at all, yet the thought of getting on the phone with people is just unbearable.

Maybe it is just anxiety? I don't know. But the fix is more people-time, and also a diverse set of activities. Pick up a sport, learn singing, strength train at the gym etc. When you have a lot of different activities lined up, you are almost never dissatisified. Bad day at work? Well atleast my workout was good and I'm building muscle. Didn't go to the gym? Well I'm sure the weekend hike will pump me up.

The more you put yourself out there, the better the chance of meeting like-minded people.