Are my parents stepping out of line?

i completely agree with you. Im also 15 and i understand how hard it can be, and you seem to be a good kid. i think your parents are scared that something bad will happen to you. Little do the know their probably driving you away. Try your best to make things right because in a couple of years you'll be an adult, and you don't want to be one of those people that never talk to their parents.