Many times singers OBSESS over which register they are using. Is it "Head Voice"?  Is it "Chest"? Is it "Chest Dominant Mix"? WHAT IS IT?!  Don't let fancy vocal concepts intimidate you. Vocal Registers boil down to variances in breath flow, vocal cord closure, and resonance. There are actually an INFINITE amount of register possibilities. It's indeed very helpful to use labels like "Chest", and "Mix". But, be careful that you don't obsess about these labels! Many different schools, teachers, and vocalists use different terminology. In fact, you can actually make up your own labels: This is my "Comfy Cozy Power Register". Or, this is my "Floaty Flexible Resonating Register". If it helps you to understand your voice- Use it!