This is a very good and important topic, and I'm glad to see it brought up! I tick a lot of minority boxes, and I try to write for a lot of them - I love exploring new cultures and getting inside the heads of people who think in an entirely different way, and even though I try my best I do occasionally look back and go "wow, that was probably not what my character would do in that situation". 

We're all going to get things wrong from time to time, and the more we step outside of our comfort zone the more likely we are to write something that isn't very realistic. I think the two most important things to consider are 1. writing from a place of love and 2. making an honest attempt to understand other experiences. If you're uncomfortable writing characters of a different race or sexuality, don't feel like you have to in order to make some kind of social statement. Write them because you love those people and want to include them in your stories. If someone tells you you've written some aspect wrong or done something offensive, listen. They might be right or they might be wrong, but take the time to do some research with a focus on opinions and experiences shared by members of that group.

Personally, I'd love to see more people like me in media. More biracial people, more pansexual people, more wlw, more immigrants, more characters with ASD... I know that not all of them are going to act the way I think they should act, and that's okay. <3