Demigod? am i the onlyone?

So Im a 13 year old girl who thinks she is a Demigod. Im not sure if the greek gods are real or not. My name is Cali. I think i may be a daughter of Poseidon because I can breath under water, when I am sick i have to be near water to feel better. I know what you guys are thinking " Wow she is crazy." And that may be true. Heck Im starting to think I am because i believe in this stuff. Haha well am I crazy? or am i really a daughter of Poseidon? If not Poseidon maybe Apollo, or Athena. Haha well let me know what you think.