what opportunities for high school students interested in medicine?

Can you recommend some good summer programs for this? Can you also suggest any programs for the summer or school year that allow for real world experience? Someone mentioned becoming an EMT - is that possible in high school? And others say “shadow a doctor” - do you just ask doctors if you can do this or are there established programs for this? Bonus points for anything in Austin, San Antonio area but anywhere is great. Thanks!