If it does makes you happy, you wont be thinking anything else when you are doing that particular thing.. !!! If it really makes you happy, you can feel satisfaction while doing that something. You wont even realize that the time is running out and the very next day you might start missing the last day. ... That's why someone told " The things that made you laugh will always make you cry when you realize that those moments are gone.. "
My personal opinion. " Just enjoy each and every thing you do, you can find happiness.. try not to hurt someone on the way to our happiness :) :) "