Welcome to the site Rei,
Yes the people here are very diverse and some will have similar interests and backgrounds.
Sounds like you are blessed genetically with natural features that many TGs would die to get. And maybe some of the people around you can sort of tell your looks and behavior is feminine inside, or like you say, the sister they never had. So if you ever chose to make your gender expression public, doing so might not be that hard.
Welcome again to the boards. Feel free to add more about your experiences, questions, what you want in life, and such.
Ken/Kendra