I have not had sex.. still my hymen is not intact due to fingering.. what can i do to prove it that i really haven't had sex?

Not to worry: It is impossible to prove sex did not happen. No adult can prove he or she did not have sex. Women and girls may be judged by their happiness, their friendliness, and many other wonderful traits, but not by the condition of their hymens. It makes absolutely no difference whether a person has a big hymen, little hymen, broken hymen, unbroken hymen, etc... One need not worry about hymens.