How to become a physicist

Hey guys, i know wht am gonna may sound insane to some people but hear me out. I am in my last year of doing mechatronics engineer but since i was a child i used to ( still do that) love physics and how the scientists came up with this idea starting from greek philospher theoris to classical to quantum and i admire them so much bec they shaped the world and i know engineering is applied physics but still i want to become someone who can help the world. The problem lies where i start , what should i do , where can i find all the materials i want .