People who have been to concerts, how do yall persuade your parents to let you go there?

Idk whether this is a protective case or whatever but my parents seems to not let me go anywhere. I wanted to go for my first concert which Ive been saving for it for a while. They seems to be saying nah its not good for me and all. Saying that money can be used for something better. They judge me for being in my room but when i wanted to have fun with my friends and all, they say its a waste of time. I am 20 now. I can handle myself. Its like they are seeing me as someone untrustworthy. I always need to obey them. I wanna have fun too.. I wanna enjoy my youth like they did too..