Graduate school for chemistry or biochemistry

I’ve recently changed my major from ChemE to Biochemistry and talked to my new advisor about graduate school options. He told me I’d need to get basically a 4.0 for the next four semesters to have a chance at biochemistry graduate school. This is really scaring me.

I have a GPA of about 3.2 right now (that’s from 3 semesters in engineering/intro science classes)
My stem GPA is currently about a 3.0 (I got a C in Engineering Calc 2/3, which was during my first semester in college and an accelerated class)
I’ve been working in research for about a year in pharmaceutical engineering, but most of my work is now biochemistry-based. I’m working on a funded project this summer in the same lab.
I’ve had leadership positions in a professional fraternity, an honors fraternity, and the university marching band.
I still have 5 semesters left of college, at least. I was thinking about taking an extra semester because my engineering classes have left me dangerously behind on gen eds.

Am I completely screwed for biochemistry grad schools already? Are my chances better if I major in chemistry and aim for grad school outside of medical colleges?