Józef Rubin Wybicki was born on 29th September 1747 in Będomin, in the vicinity of Kościerzyn, in the noble family of Piotr Rogal and Konstancja Lniska. He studied in the Jesuit collegium in Stare Szkoty where he quickly experienced the effect that the unprogressive educational system had on him: he had to learn everything by heart, which excluded independent thinking. He and the other students also suffered from cruelty in the form of moral and physical pressure.
This led him to organise an attempt of a student mutiny and, in consequence, expulsion from the Collegium. His paternal uncle managed to secure him an apprenticeship in a law office which allowed him to continue his education as a lawyer. Again, Wybicki did not find his place there – studying law echoed his education in the Jesuit Collegium, it was mostly mechanical repetition of legal formulas without understanding them. As it turned out, his later endeavours tied his life with constituting and executing the law.
He became independent very early. In 1765, his paternal uncle Franciszek, who took care of Józef and his siblings, died. The 18-years-old Wybicki began adult life. As early as in 1764, he entered the world of politics by taking part in Stanisław August Poniatowski's election. Dramatic political events were to occur four years after that. In the years 1767-1768, Wybicki took part in the ‘Repninian’ sessions of parliament, named after Russia’s ambassador in Warsaw, Nicholas Repnin, who intimidated its partakers and enforced his laws. One of them was the recognition of the dissenters' laws, in fact aimed at giving privilege to the Orthodox Church which was supposed to become a tool for russification. Repnin caused the abduction and imprisonment of two Polish bishops in Kałudza: Kajetan Sołtyka and Józef Andrzej Załuski. Wybicki, barely 21 years old at the time, delivered his first public speech in which he denounced the lawless act and Russia's policies in relation to Poland. This made him famous – also because the young lawyer tried to employ the liberum veto rule – infamous at that time – for the public good. This had no effect – during the Repninian sessions of parliament, the liberum veto rule was not in force and the king, startled by the young deputy's courageous address, held off the parliament's session.
Because of this scandalous speech, Wybicki had to hide in Warsaw and sneak out of the capital. He took part in the Bar Confederation (1758) and was the confederacy's Gdańsk emissary (their help was needed in order to execute an insurrection). In 1770, under the fake name of Josephus Enkler, he studied law, natural sciences and philosophy at the famous Leiden University. However, in 1771 he returned to Poland where, under confederation's orders, he was establishing diplomatic contacts with the French deputation. He settled in Poland for good in 1772, after the confederation's defeat and the country's First Partition. In 1773 he married Kunegunda Drwęska, who was seventeen years older than him. However, the marriage lasted only for two years because of his wife’s death.