my parents used to be super controlling, until i went away on my gap year and they realised i could actually look after myself (i had been trying to tell them for years!!)
i alsi sat them down one day and said look, im 18 now (this was when i was 18) you cant make my decisions for me anymore, infact i wont let you. I basically told them it was on my terms or not at all.
I do have to keep reminding them but now i just come and go as i please and every one is cool with that.
All it took was an adult conversation... ***you have to find out what they fear and then reassure than that it i unfounded!!!***