This is unfortunate and must be very frustrating for you.
I’m sure you know that your parents are setting themselves up for disappointment. Even with a perfect GPA, high test scores, and stellar EC’s, the odds of getting admitted to Stanford without a “hook” (such as being a recruited athlete) are long. It sounds like you’d be considered an underrepresented minority, so that will be a help, but Stanford is still unlikely. Luckily, you sound like you’re okay with that! You’re a junior, already thinking ahead, and there will be many excellent colleges that will be happy to admit you.
The problem is that your parents aren’t likely to be much help with identifying good match and safety schools, and getting excited about the many good options you will have. You’ll have to find other people who are able to support you from a place of greater objectivity. Here is a good place to start!
In addition to getting your own needs for support and guidance met, you’re unfortunately going to have to deal with your parents’ feelings about the process as well. While I am not recommending that you mislead them about anything, you also don’t have to overshare. Sometimes “smile and nod” is the life skill to call upon.
They’re right that GPA is important. But your grades are not bad, and an improving trend is great. And, you’re right that pursuing genuine passions, and not just trying to jump through hoops for the sake of college admissions, is important too - not just for college admissions, but for you and your path toward becoming the adult you want to be. Unfortunately, your parents may not be able to get into that authentic head-space with you at this point. Hopefully you can find other sources of validation and encouragement, because it sounds like you’re on a good path.
Your parents just want the best for you, and some of their advice may be good. Try to take what helps and “smile and nod” about the rest. You know what you need to do. Get the best grades you can, and pursue EC’s that you care about. Build a balanced list of potential colleges. Talk through your plans and goals with people who can be supportive. You have time, and you don’t need your folks to be on the same page with you every step of the way. Apply to Stanford if they insist; just have other schools on your list that you’ll be happy to attend, and let your parents come around in their own time. All easier said than done, I know, but your relationship with your parents will last much longer than the college admissions process. The day will come when they will be bragging about your accomplishments and insisting that they wanted you to attend College X all along. 