Are there any undergraduate research/internship opportunities in math/science education/history?
Find some people doing your dream job.  Write to them and request an opportunity to do a shadow as part of your career exploration process.  Include a copy of your unofficial transcript and CV.  Make it clear that you would be grateful for any advice they may have about where to study, and any additional degree, coursework or job experience that would help you achieve your goal, but make the advice part optional.  Let them know how to contact you if they would find phone easier than email.

Please also consider applying for science outreach jobs.  These might be available at a research institute that is part of a large university.

Sometimes people create such a job organically, starting by doing this and that while employed doing something else (possibly related).  For example, enrichment classes taught after school at elementary schools.  Being a community advisor for a science club at a middle or high school.