I spent 6 years trying to change myself in ways so others read me as being male. I tried haircuts, talking certain ways, walking certain ways, binding, packing, wearing different clothing, etc until I was no longer myself. At some point I realized that no matter what I do I cannot change how other people see me. When I "gave up" I started feeling better, and all the times I put little to no effort in how I looked I would end up being read as male. Now I have a slight fear that after months and months of T I'll still be read as female. Heck, my friend has been on T for a year and just recently started being read as male on a regular basis.
Testosterone will change your body fat distribution, including the fat on your face. Your jaw line will look more male on T.