Ma parents aint comprehensive...?

well im a 18 yo french guy,i got a problem with ma parents,thay r kinda scared n anxious way too much about me,i mean im 18 and i nid ma freedom,they think im still young for drinkin/smokin,they say that they kno ma gud betta than me,and im not mature enuff to hang out outside home til midnight,not even 22h,,,ther strict and they say that they trust me but i cant see why cant i live a normal life like all teenz of ma age,sry bad english thx for help..