Submittable is a site that lets you easily search for tons of contests, literary journals, magazines, and more that are accepting content submissions.
There's a lot here, but you can easily enter search filters to look only for essay contests, or photography, or contests that don't require application fees (we recommend filtering those out), or contests with certain deadlines.
Control your own destiny by finding places—on your own—that you can submit your work to! Any acceptances you get always look great on college applications and beyond, and with each entry you can feel more confident about the next one. (And remember, rejections are a fact of life, so don't worry about them at all. If you really want to start getting published, then keep creating, keep submitting, your work will continue to improve, and eventually you'll get an email that begins, "Congratulations!")