Question regarding application for internship

Hey guys. if you haven't seen my introduction thread, I'm bnsly, a high school student from the Bay Area.

Anyways, I have been considering applying to an internship quite recently but was disappointed to find out that it was for those with at least a high school diploma. Considering that i'm a high school student, I haven't gotten one of those. Should I still try to apply? There's no college requirements, just a diploma for high school. Should I attempt to call them up and ask them if there is a possibility for me as a HS student? Or would that seem too troublesome? This is an internship in wealth management if it helps.

Thanks for any response,
dom