Formal educational internship in bio that doesn’t require age 16 is almost impossible. But if you let go the preference of science or technology, then hospitals are the easiest place to find internship because the work is physically difficult and never ending. Try visiting local small doctor’s office with a resume. It might be a one of busy day and they might have a growing list of patients to call for appointment confirmation or beds to clean.
Such experience can make you highly competitive when you eventually become 16 and ready for those extremely competitive internships at a major university hospital.