Oh now those are much clearer pictures! Your hair is not 3C.
Your curls are much to large.. in the smaller pictures your curls looked a lot smaller. It looks like a 3B and 3A mix in these bigger pics..I'm not sure about the front of your hair... I don't know I've never seen hair like that before with such a disparity in curl pattern..unless it was damaged in some way from heat or hair color. But you said you don't use heat..so... IDK. But the bulk of your hair is much larger than 3C or type 4 curls that's for sure. So I'd just say 3B/3A and focus on my hair properties.
BTW.. my name is M-A-R-A-H. Not Mariah.. like Mariah Carey.