While this question applies to me it is being edited to become more general in accordance with the rules of this site.
If an infant, the child of a non-Jewish mother (and therefore not Jewish), is adopted by Jewish parents as a minor, but that child is raised Jewish in a home that keeps Shabbos and kosher, what is the correct procedure to prove that this person is or is not Jewish once they become an adult? What should have been done, and now that the person is an adult, what should he or she do? Is having had a bar or bat mitzvah relevant? What about having attended an Orthodox shul?