I suck at singing, how can i get better?

I want to sing good, but i dont want to spend my parents money on
singing lessons. Im a boy, and i know theres great singers who never
spent money on lessons, and somehow got good. I know i have to sing,
to get better. I do sing, but i want to hit every note right. I have
the whole summer to get better, thanks! please answers from people who
answered this question a long time ago, before consulting me, thank
you!!!!!!