What do you young adult door feel like doing when your parents don`t want to you freedom?

I am 19 year old teenage girl and my mom don`t want to give me my freedom. my mom told that she will only give me my freedom when I turn21 year and when tell me that , I feel like killing, or hurting myself also feel like running away from home . hint; today I was feeling this way, I almost rolled down my school stair but best friend stop from doing it she took straight to school counselors to talk about my issue or problems. please answer this questions as soon and fast as possible.
Asked Dec 04, 2014
Edited Dec 04, 2014

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