Dear Rabbi, I have two simple questions, I’m 18 year old, and did not have a bar mitzvah, does that make me less of a Jew? –
I have search and search, but could not find the answer, who the last prophet was?
Not at all. You are just as much a Jew as any other Jew. “Having a bar-mitzvah” only means commemorating a person’s coming of age (reaching the age of thirteen, when a Jewish boy becomes responsible for his actions, and obligated in the performance of the Torah), which happens whether it is commemorated or not.
The last of the prophets was Malachi, which is also the last book of the Trei Asar, and closes the book of Prophets.