Grounded at the age of 22?

I am 22 years old, which is one year plus the legal age, and yes, I am grounded. But it’s not the dictatorship type of being grounded. In fact, there’s still space to breathe in, but the space is just about the size of a keyhole. I must say that for me, the keyhole as a breathing space is not that enough. I could still feel a bit of choking once in a while.
I know my limitations well enough. But then, I would not want my limitations to be set by other people. I am over 21, and so, I am responsible for my actions. I know what’s right or wrong. I am an independent person.
I guess my parents are just way too protective and that they did not see me to be like this since I was the geeky type, and most obedient daughter so to speak. I appreciate their care and concern but at my age, I think they should let me be and let me learn all the consequences.