Many entry level jobs are not advertised. Job announcements often are circulated from within. Inform them that you are searching for a job and explain the type of position for which you are searching. Look at all related job descriptions as you will be qualified to work in many settings. Since the term health educator, as used in community settings, is relatively new, you may find other descriptors used in job announcements.
Graduate school offers more specialized study.
A general recommendation is to work first in a field related to the area in which you want to concentrate. Work experience may help you further identify your special interest areas and help you connect theory to applied practice. Get as much volunteer and internship experience as you can as an undergraduate. Many graduate schools in public health require a certain amount of experience in related fields in addition to good undergraduate grades and acceptable scores on identified exams. Don't be too intimidated to apply to graduate schools.