Hi Kelly, First of all, it is wonderful that you are thinking of being an engineer. While you need to know that basics of both physics and chemistry to be a mechanical engineer, unless you decide to major in areas such as bio chemistry, optics etc (just to give you a few examples) you will not need to deep dive into the topics. Mechanical engineering is a very widely applicable field. Mechanical engineers find jobs as aerodynamic engineers, as design engineers, as HVAC engineers, as structural engineers, as quality engineers, as fluidics experts, as quality engineers, as automotive engineers, as metallurgical engineers, as material scientists.... the list is so long! There is no fixed formula for being a good mechanical engineer. It completely depends on where your interest lies and what courses you choose to excel in your field. I had started my career as a design engineer and a few of the courses that were very helpful to me were mechanics, engineering drawing, design of machine members, solid mechanics, fluid mechanics etc... most of the courses I took during school help me in one way or another throughout my work life. More importantly what the course structure inculcated in me was critical thinking skills and a logical thought process. Feel free to reach out to me with any more questions you may have. I will be more than glad to help you out.