If you could think of at least 10 better ways to spend your time and money, then you should probably cancel those plans (and do one of those 10 other things you'd prefer doing).
i wanted to cancel all my weekend plans to sit on the couch and eat popcorn, but i decided it'd be better to just fucking go anyway. there's so much time for me to hangout at home alone, i should enjoy the times i can see my friends