Advise on overprotective parents!!!

<p>I am 20 years old (about to be 21 on the 31st) and in college and my parents still treat me like I am a child. I stay in a one bedroom apartment on campus, I have been working on going for two years, I pay for my own food and basic necessities, and I also pay my own Credit card bills. They are wanting me to download an app where they can keep tabs on me basically by knowing my location 24/7. My dad basically ordered me to download the app and keep it on regardless and it really pissed me off!!!! I'm tired of them treating me like a child and there is no need for them to want to know where I am all the time!!!! I even asked to pay my own bill today and my father refused until I graduate from college, which is the dumbest shit I have ever heard! I share a family plan with them so I am going to separate from that and pay my own phone bill soon. I know this is long but please give me some advice, I'm planning on speaking out to them but they never want to hear!!!</p>