Most college students are so focused on the next assignment (or athletic event, or party) that planning ahead for post-graduation doesn't get much attention. Ironically, career planning can be rather like studying - you make it a habit to study every day and the exam will usually go well. If you procrastinate and cram at the last minute you will be stressed-out, not as prepared as you should be, and you probably will be disappointed in the results.
For some ideas to help you plan ahead, take a look at this post at Lifehack.org. I especially like #6 "Pay Attention!" Most things you see on self-help sites are really common-sense. But if you don't do anything about it, having common sense doesn't help much.