We share a lot of life advice here at Lifehacker, but this comic pretty much sums up everything you need to know, courtesy of Zen Pencils and Bill Watterson's famous 1990 Kenyon graduation speech. It's the best thing you'll read all day.
I know that Scale of the Universe part 2 was just posted recently but I still like the original better. The updated version is largely the same now with wiggling earthworms or birds with wings flapping. Just sort of distracting.