Should I live more on my childish side or my mature side?

(I'm home schooled)

I'm having issues. I have two older sisters who moved out and are married, and now I live with two younger siblings and my mom and dad and I'm stuck. I'm around my younger siblings more, and their still less mature than I am, but their the only ones I can talk to and do things with. Then I have one of my online friends who I talk to frequently, and I keep going back and forth and it's driving me nuts!

I'm still into some kids shows and cartoons and stuffed animals, but then I love talking about crushes and teenager stuff. I need help!!