I have left the building

I have left the building.
So I did quit my job. mostly feeling huge relief, and motivated to new upcoming stuff. However, people were quite suprised to hear that. I guess accepted answer to this kind of question is to say like "I feel sad to leave now, after all these years we have been together yadda yadda". If it feels sad to leave why to leave at all? Even my boss was suprised to hear that I mostly think of moving stuff etc. Oh well, as been said before - there seem to be "accepted" way of doing things and any discrepancies makes you different, not the others.