Mental Health Help

Hi! I am 16 years old and currently in high school. i really need some help, mentally, but i don’t know how to go about getting that help. i’ve been asking my parents for years to go to therapy but they always tell me we don’t have the money and our insurance doesn’t cover it. my health has been getting worse and i feel as if i am seriously going crazy. i really need some help, but idk how to communicate that to anyone and get the help i need. i just need advice on how to get some sort of therapy/other professional mental help, as a high school student. thank you!