英语句子在线改错

Im a [high school senior] student who [is going to take] the college entrance exam soon. I [am facing] a problem in choosing my major. My parents want me to study international business, [however] my head teacher [suggested] that I [choose] software engineering. As for me, I [have] a [totally] different idea.
I want to take environmental science [as] my major so that I can [use what I have] learned to help improve the environment [of] my hometown [upon] graduation. But can I [really] make [the] decision on my own[,] against the will of my parents and my teacher?
Im writing to you for [your] opinion. Would you please spare some time to give me some [advice]?