I think you’d be a strong candidate for any of these schools - your grades and ECs are impressive, especially for an eighth grader. Even so, I’m sure you know that no one on this forum can tell you your chances, seeing as no one is ever guaranteed a place. In terms of general advice (and things I wish someone had told me before applying):
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Take the time to explore your passions! High school especially is a time for you to find things you’re interested in and become better at them. It seems that you’re already pretty involved in several activities, so keep dedicating your time to them! Prep schools aren’t looking for grades, but people - show them who you are and what you like doing! I’ve never met anyone involved in operatics, so that’s a great thing to differentiate yourself with when applying.
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Your essays are one of the most important, if not the most important, parts of your application. They should tell the AOs reading them who you are, what you value, and what you’ll bring to the school. Incorporating a personal narrative is awesome, and definitely something you should do next year too! Anything that tells them more about you is a plus.
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If you have the opportunity, take advanced classes. It’s important to show the schools you’re applying to that you genuinely enjoy and have a love for learning, and taking challenging courses is a great way to do this. If your school offers Honors/AP, try incorporating some of them in your schedule. Getting perfect grades in an easy class matters far less than challenging yourself.
Good luck! Keep in mind that regardless of the decisions you receive next year, you’re still someone who has infinite potential. Going to one of these schools doesn’t define you - although they give you more opportunities, it’s ultimately you and your own motivation that decide your future.
Unrelated, but I’m also Romanian! Are you applying as an international student? If you need any help with the application process, feel free to PM me!