I'm mixed too. My dad is half-Somali (African) and Indian (from India), and my mom is white.
My hair is a mix of 3a and 3b.
I had such a struggle with my hair growing up. When I was younger, it was really curly, like in my profile picture - then I used to brush it out so it would be wavy. Then in middle school, I wanted straight hair, so my mom let me relax it. (Worst decision ever) It took me almost three years to grow that damaged mess out. Now I just let my curls do what they want. I swear by Kinky Curly Curling Custard.