Just talk to them and say I think I am old enough to have more say in my life and I want you to start trusting me with more stuff and If they get angry just ask them this how am I suppose to prove to you that I can be mature if you wont let me have a chance to show you.
One way you can show your parents you are mature is by: not getting angry quickly ( have a lot of patience), don't ask them nothing about maturity because that comes naturally, keep things clean in y'all household even if you didn't do it, never talk back just let them have the last word because at the end of the day you know the difference between right and wrong.