A few weeks ago, I applied for an international fellowship for after graduation. I had to write a personal statement and proposal, and I found myself struggling to represent my achievements and personality.

That’s when I realized: You’re never quite done writing your college application essay.

High school seniors know the enormous amount of pressure surrounding the application essay, coupled with gripping fear of trying too hard, or not hard enough, to impress the fickle readers in the admissions office. When I was applying to colleges, I felt as though I had to capture my whole personality, resume and soul in the span of a few paragraphs.

So I might have a tough time convincing you that the application essay is a good thing. But hear me out.

For all the aggravation they cause, college essays provide an excellent opportunity to create an informal, lively piece of writing that explains who you are and why you are that way. It’s a chance to show colleges that you are more than just a collection of numbers, letters and extracurriculars.

Kathleen Ellis, owner of the Writing Coach, which works with a range of clients from academics to business owners, explains: "The personal statement and the college essay are the best vehicles for describing and explaining who the writer is. It gives students the opportunity to talk about what motivates them and what they care about."

Finding the right words might be a struggle, but the rewards come as you discover what elements of your life are important enough to put down on paper. Figuring out what you care about and what it means to you is a natural part of growing up.

That explains why writing application-style personal statements doesn’t end with college applications. Almost any job application requires a cover letter, a document sent with a resume elaborating on the applicant’s experience and qualifications for the position. Further, personal statements are needed for scholarship entries, graduate school applications, research grants and countless other pursuits.

"I think if you can write a good college essay, you can use the same skills to help you get your dream job and climb up the career ladder," says Ms. Ellis. "All share an essential strategy: telling a compelling story."

This is a good time, too, to stop being self-conscious. Writing about yourself can feel forced and uncomfortable, but it is essential for your academic life and career. The college admissions process helps ease students into the lifelong quest to write effective personal statements.

"If you don’t know how to toot your own horn and represent yourself, no one will do it for you," says Dawn Josephson, a writing coach who advises businesspeople and professional speakers on documents just like these. "You have to get used to writing about yourself."

Here are a few tips I found helpful in learning how to write personal statements that are truly personal:

Avoid clichés. When writing about how something has changed you, it’s really easy to lapse into overused or canned phrases—"opportunity of a lifetime," or "life-changing moment." While clichés can sometimes be useful to express a particular type of emotion or situation, admissions screeners and future employers get tired of reading them. Try to describe your experience in a new and different way, one that helps the reader understand you without rolling their eyes.

Tell a story. A good way to start describing yourself without clichés is by using personal anecdotes. A story can often say more about you and your experiences than a description ever could. Ms. Ellis advises clients to pick a small but significant moment, have an exciting plot that shows a journey, and describe the scene with concrete details. It’s a great way to keep the reader attentive and to create a memorable application.

Be authentic. Don’t be afraid to show your personality. Personal statements are not academic essays or exams, and you can be a bit more informal. But make sure you’re presenting yourself authentically, and not just saying what you think will work. "It’s easy to write something that you think someone else wants to hear," Ms. Josephson says. "But if it’s not authentic, it will come across [that way] in other parts of the application and in interviews."

Show Confidence. It’s often hard to write about yourself without coming across as conceited. Try to find the right balance to show you’re proud of what you’ve accomplished, but recognize how much there is to learn.