True.
Like, I also thought about this, when I was workin until 10-11 on night, and my mates asked me "you're goin' with us? cmon, join us! we're going to a cool club, taxi is waiting right at 00.00!".
At the beginning I was like "I don't feel like dancing (
http://www.youtube.com/watch?v=4H5I6y1Qvz0&ob=av3e lol), I'm not in the mood, nah", but when they came into my room right at 23.45 or so asking again, I were not in the mood too, but I said who cares, either go to bed, sleep, wake up, or go with them, either have a freakin good night or sleep in the club.
So whenever theres a chance to so anything, do it. Just as sparr wanted to say, feelings suck, don't trust them. if you dont feel like it, do it ^^
It's just like working. You don't feel like it every morning, but you do it. ^^