In 2002, at age 17, Castro was elected
Sangguniang Kabataan (SK) chairman of Barangay Lias, Marilao, Bulacan. Not long after, he was elected as the SK Federation president of
Marilao, making him an ex-officio member of the
Sangguniang Bayan of Marilao. He was awarded as the “Most Outstanding SK Federation President” and with the Gintong Kabataan Award in the Gintong Kabataan Awards in 2005. While fulfilling his duties, he obtained his Bachelor of Science in
Mass Communication degree from the
Far Eastern University in 2006. He was elected to the
Bulacan Provincial Board as a member from the
4th district in
2016. During his first term, he was concurrently serving as the President of
National Movement of Young Legislators (NMYL) for
Region III. He was then re-elected in
2019 and was named as NMYL's National Assistant Secretary General early in his second term. He was awarded by Gawad Filipino as the Outstanding Public Servant of the Year in 2021. Mayor
Ferdie Estrella during the solemn dedication of Saint Padre Pio of Pietrelcina Chapel in 2024 He ran for vice governor of
Bulacan in
2022 as the running mate of incumbent
governor Daniel Fernando and they both won. He was named as the National Chairman of NMYL and the Regional Chairman of the League of Vice Governors of the Philippines for
Central Luzon for 2022–2025.
Legal issue On May 6, 2024,
whistleblower “Francisco Balagtas” filed with the
Ombudsman a 3-page
complaint dated May 1, 2024, against
Daniel Fernando, Castro, other local officials, including TCSC Corporation’s owners-officers Dionisio Toreja, President, Engr. Bernie Pacheco, Vice President for Mining, and others. The corruption case stemmed from the alleged anomalous Bulacan Flood Control and River Restoration Project, including TCSC's Bulacan
dredging projects. ==Contestant at
Are You The Next Big Star?==