Okay, I agree with @anon9217557 that you should NOT be writing stories about experiencing racism when, you, have NOT experience it. Your story can be so many things than writing about racism. So think of something different, I don’t also speak on behalf of POC, so they have their say on this, and I think you might want to change up your story a bit.
So, your story doesn’t always have to start at school, it could start somewhere else. I’m still trying to think of some ideas, like let’s say the MC is working somewhere, and the MC best friend is introducing the MC to music, and the MC loves to sing, and start songwriting.
The MC can start singing at home, and, or at work, writing songs about her sexuality, and acceptance. Uh, hm. still thinking…still thinking.
If you need a new story idea, feel free to ask. To take out racism if you are going to take it out.
Your story can be anything: Spy/Agent, Superhero, Detective, Famous Singer, etc. any job that your character can balance both lives. What will be their struggles? Will they have someone to trust or betray them etc.
A double life is not about dressing up, and making videos, and going viral. Double Life is basically balancing both lives as a different person. I hope I explain that right. 
Example: Superman, or any other superheros. He’s known as Clark Kent, he’s a daily new reporter, dresses professionally, has a good personality and his secret life is a superhero, he dresses in a superhero suit, and his personality is different and he battles enemies.
So that mean, the MC has a current job, and at night time, the MC have a secret job. It could be around day, evening, night time. if you want to stick with music, watch the movie Hannah Montanah, and get some inspiration from the movie.
She balancing both lives as a singer and a farm girl, I think? So yeah, I hope this helps somehow. Man, my mind is spinning. Or check out other cartoons, like superhero ones. Totally Spies, Miraculous Ladybug, etc.
There’s so much more than you can write about than racism, you don’t need to include it.