i am 15 years old boy

i heard,chandelier song by sia is hard song..i need chest foice,falsetto and head voice in the chorus..i just want learning how to singing better..this is my video https://youtu.be/zSdcbPXcuiY.. what note is it?at the chorus and sorry for the crack😂i am 15 but i think i am baritone..i still learning to finding my head voice,i hope you guys can help me to sing better,thank you😄