You are a titan shifter and not just any titan shifter but one similar to the original, Ymir Fritz. Unlike Ymir all abilities you possess are your own and over your complete control. Said abilities include all of the original nine titans abilities, immense strength, and a regeneration factor that would allow you to regenerate from anything as long as you have the will to live.
As you grow experienced with your powers, you may develop new features to add onto your titans and even make others titan shifters themselves.