How can i become a good singer without lessons?

Sorry, but the only way to learn the correct and healthy singing & breathing techniques is to start taking proper singing lessons or at least consult a fully trained vocal teacher. Do NOT rely on any web tutorials, because they are very often quite hazardous for anyone's voice. You surely don't want hoarseness, vocal nodules and other nasties like that? Of course not! Also, your voice is unique, so there is no need to try to imitate anyone famous. That way one can easily damage the voice too!