There's no better time to begin writing or updating your CV. This document will constantly be revisited for years to come, whether you are in still in School, Further education, Higher education, training, unemployed (job hunting) or in the workplace (employed).
Starting your CV now will save you time and hassle in the future when a potential employer requires you to provide them with one.
Below are some of the reasons people are put off writing their CV / Resume.
I've just started college and don't have anything to put on a CV yet.
High school experience is fine to put on your CV. Coursework, Clubs attended, and part-time jobs are all relevant. Use your high school grades and events as building blocks for your college accomplishments.
I already have a job, so I don't need a CV / resume.
You may not think there is a need now that you are employed, but, nowadays there is not much job security. Opportunities for your next role may be just around the corner, an up-to-date CV will benefit you no end.
I'm not applying for any jobs right now, so I don't need a resume.
You might not be applying for a job right now, but the sooner you start your CV the better. Remember your CV is a work in progress. Many of us stress over our CV more than we have to, trying to remember dates of past education, employment, training etc...
Start now it makes for an easier time later.
Conclusion
The terms "resume" and "CV" are used in different ways all over the world.The primary differences between a CV and a resume are the length, the content and the purpose. A resume is a one or two page summary of your skills, experience and education. A goal of resume writing is to be brief and concise since, at best, the resume reader will spend a minute or so reviewing your qualifications.
A CV, is a longer (two or more pages), more detailed synopsis. It includes a summary of your educational and academic backgrounds as well as teaching and research experience, publications, presentations, awards, honors, affiliations and other details.