The two largest components to your law school application are your GPA and LSAT scores. Other components include a personal statement and letters of recommendation. Both GPA and LSAT scores are used to help determine if students are adequately prepared for law school; they are often the first criteria viewed by admissions. However, students are well served to show well-rounded applications with both academic and community experience.
You can always try again. Apply to the same schools. Apply to different schools. Take more courses. Improve your grades. Gain more relevant experience. Mature.
Planning for alternatives in advance, however, can give you more options and flexibility. For example, you can apply for competitive internships, study abroad opportunities, and non-profit experience along with law school. If you receive multiple acceptances, you have choices. If you do not get accepted into law school, you have an alternative in place that will make you more competitive should you decide to apply again.