My parents dont trust me?

Basically, im 15 years old. Im a good student and i usually always listen to my parents.

But they dont trust me. I have to be home at 4pm when i go out otherwise they threaten to never let me go outside.

I have to be home straight away after school and i have no freedom.
It really upsets me because i love my parents but they dont trust me. I cant confront them because they'll just tell me to stop being silly and go away because that is usually their answer to everything.

Any advice??