I sometimes feel a bit like this too - like I'm completely numb, like anything could happen to me and I would have no real response to it - kind of like I'm sitting back and watching my life happen to someone else!
I have been seeing a counsellor for the last few months and she has really helped me to connect back to life and acheive some sort of emotional intimacy with people and myself and I am also feeling a certain amount of contentement.
Maybe you should see a counsellor? or talk to someone about how your feeling and why!