Has the girl lost her virginity due to her previous practice of masturbation, and what is the reason for the bleeding she saw after an anal itch, and has masturbation affected the hymen or sexual activity?

It is not permissible for an adult to consider himself a child, because childhood ends with puberty. Masturbation is forbidden and has harms, one of which is the loss of virginity. It might also be mere delusions. It is not necessary to inform the suitor about the loss of virginity, and it is not permissible to tell him about engaging in masturbation if he asks after marriage, because concealing sins is obligatory. You can tell him that you did not commit zina (fornication/adultery) and that there are many normal reasons for the loss of virginity. Repenting is a good thing, and one should not despair of Allah’s mercy. Ghusl (ritual bath) is not obligatory merely by engaging in masturbation, but rather by the emission of semen. To make up for missed prayers due to ignorance of the obligation of ghusl from janaba (major ritual impurity), one can refer to the fatwas related to that.