You are Augustus Caesar
Augustus was not the flesh-and-blood heir to Julius. He was born Gaius Octavius, a grand-nephew of Gaius (Caesar) Julius who would become president of the Republic, but right now is just an over-the-hill statesman who was thrown out of the priesthood job his family had landed him over charges of his wife's sexual misconduct, chilling in Spain, racking up a mind boggling amount of debt and wondering how he will ever amount to anything.
Gaius Octavius' father would die when he was young and some unspoken family drama would result in Gaius being taken from his mother and raised by Julia, Gaius' grandmother and Gaius Julius' sister from age 6 to 10, at which point Julia died and his mother and step-father resumed custody.
Despite working in the Temple his grandfather Gaius Julius had built before the sexual misconduct allegations, there's not much making it clear if Gaius Julius, traveling as often as he was at this age, knew his grand- nephew at all.
Gaius Octavius sought out his grand-uncle, who had since found a way to dodge his debts by using the army he had bought with the money to invade the capital. Julius was currently in Africa fighting to hold together his new position when Gaius Octavius supposedly boarded a boat to join him.
Along the way, the story goes, Gaius Octavius was shipwrecked and crossed enemy lines with a small group of comrades to reach the city where Gaius Julius was staying. The story is very reminiscent of an experience being kidnapped by pirates that Gaius Julius had himself at roughly Gaius Octavius' young age.
Trading on the story, similar first names, and family connection the lad impressed Caesar, who sent Gaius Octavius to school in Albania to be trained as a soldier. Unknown to Octavius, but known to your time traveller, Gaius Julius had been so impressed, he adopted Gaius Octavius and named his grand- nephew heir to his wealth in his will.
Two years later Gaius Julius Caesar would be stabbed to death by friends and associates while in the Senate in Rome. Gaius Julius (formerly Octavius) receives the news while in school and does something remarkable for anyone, but even more so for a 19 year old: still penniless, because he had not yet collected his inheritance, he steals the entire treasury that had been earmarked for an upcoming war in the middle east, uses the money to personally recruit Gaius Julius Caesars soldiers (who considered themselves working for Gaius Julius personally and not the government) and marches on Rome surrounded by his new army (and now in charge of the largest military force in the world at the time).
The person who would become Augustus Caesar showed incredible prescience in his decisions then. Mark Antony, one of Gaius Julius Caesar's generals who had been present in Rome during the assassination, refused to release Augustus' inheritance. Nevertheless, by allowing other members of the political class to think they could use the young boy as a powerful tool, the boy was able to manipulate savvy experienced politicians into allowing the new young Gaius Julius to use his army to run Mark Antony out of town. A year later, Cicero helped induct the plebian commoner (which he was) into the Senatorial class, made him a Senator, and legitimized his private army. Then, the politicians tried to sucker the new Gaius Julius into turning over control of his private military to the government. The new Gaius Julius refused, an incredibly bold act that could easily have turned to civil war - but your time traveller would know the Senate cowed.
Augustus continued to make extremely shrewd choices for the rest of his life, only serving as president of the Republic for a very short time, but keeping a newly invented legal title that gave him even more legal authority than the president. Despite this extra authority, he only used it once. He invested heavily his grand- uncle's military and financial wealth, winning many friends, but never ceding control.