/fa/ - Fashion

I have very thick, wavy, and bushy hair. It's not so oily but not so dry either. Texture is like straw. Especially from behind it looks too puffy, makes my head big looking. I can't give it a shape with my hands or comb, which makes it even worse. I even got back of my head shaved (it cannot be seen, just sub part) but it didn't work. After I straighten it, it becomes soft which is nice but I really don't want straight hair. I just want a thin looking, a bit wavy and soft hair. What should I do?