You were bit by the same spider that bit Peter you two are best friends and when it bit him he accidentally threw it at you in his surprise and pain and you two was bit and you two debated on who will get the title spider man and spider kid you unfortunately lost and now spider-kid because you are a day younger then him that is the augment he use to win the argument and now you are a hero duo who both guardians his aunt may and your parents doesn’t know that you two are heros