Is a career in STEM really for me? [Spectral Lines]

I just started eighth grade at a middle school in central Virginia. The school has an excellent reputation, particularly in math and science. Last year, it received national recognition for its STEM (science, technology, engineering, and math) program. I enjoy science and math, and I get straight As in those subjects. People tell me that future employers will be falling all over themselves to hire me if I pursue a career in STEM.