First thing is always to find the truest thing: think about what you find interesting in physics - what has you thinking that you would like to make a career in physics research? the more you think that through the better able you will be to identify opportunities and ask for help.
Then, start with the easiest thing: talk to your physics teacher! what does s/he know about physics opportunities in your area? who does s/he know who might be able to help?
Have you looked at the Physics Olympiads? You may not have enough of a physics background to compete at a high level, but you learn a lot as you participate, and you will meet a lot of people, including interested adults. Some of those adults may be able to help you identify other activities available in your region.
Are you near enough to a university that you could do a research internship? I’m not going to pretend that it’s easy for a HS student to do that, but it is not impossible!