I have so many things I want to do...

I’m a Junior in high school and need to start thinking about what I want to major in college.
After college, I’ve had ideas about being a:
Geneticist (Molecular)
Chemist (Laboratory)
Astronomer
Chemical Engineer
Mechanical Engineer (Roller coaster engineer)
Forensic Scientist
Biochemist

So I obviously have an interest in Chemistry. Right now, the classes I have taken in high school are:
Freshman:
Honors Biology
Honors English 9
Algebra II
French II
Band
Civics/Econ

Sophomore:
AP US History
Pre-calc
Honors English 10
Honors Chemistry
Band
French III

Junior:
World History
AP Calc AB
AP Chemistry
Honors English 11
Band
Physics
French IV (On my own time)

Senior (Planned)
AP Calc BC OR AP Stats
AP Biology
AP Lit OR AP Lang (Leaning more towards lit)
AP French
Band
Another elective undecided, maybe Forensics/Anatomy

So, the majors I have come up with are:
Biochemistry
Chemistry (general)
Chemical/Mechanical engineering
Astronomy
Genetics

I’m just having a hard time deciding what I want to do. I’ve had an interest in all of these at some point in my high school career and need to start dwindling the choices down to a specific one.
Just a background:
I’m average at math (B-C range)
I’m above average at science (A-B range)
I’m doing OK in Physics (Solid A)

You don’t need to know what you want to major in at this point. If you have classmates who seem to know what they want to major in right now, trust me, a good number of them will change career plans at the end of freshman year. If you’re average at math but good at physics, you can give engineering a try…all engineering majors usually take the same core classes freshman year.

If you can take a course in computer programming while in high school, I suggest it in order to get feedback on your taste and aptitude for that. Your relatively low apparent performance in math is of some concern, though.

As for match and ultimate employability, a health field seems for you, given the above information, the most likely.