I have my own car and I pay for my own gas, yet my parents still make me ask them if I can go anywhere.?

Like, honestly its my money so why do I have to ask? Please if there is a parent on here, explain this to me.
Update: I always make sure there's not any plans that I'm interfering with... But they make me ask every single time and sometimes they won't let me because they say im wasting their gas... but I paid for it!!!!
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