I don't know how the forget to read your school system's stuffty course list. You should've sat down with your parents to figure this stuff out earlier.
Here's your first lesson of high school: don't trip up. Otherwise, stuff will roll down hill and snowball. Maybe not always, but even the possibility of it is there. If not now, then definitely with college applications and etc. during your junior year of high school.
As far as course selection goes, and this is just my experience in a private college prep high school, freshman and sophomore years have limited choices. Your only real choices are basically variations in skill level (regular versus honors/AP) and variations in fine arts/foreign languages (French versus Spanish, Computer Apps versus Music/Art).