living with a controlling parent

okay so I'm 18 about to be 19 next month. I am pretty mature for my age and responsible. I've never done drugs , got drunk , or even had sex for that matter. I'm in college and I'm doing well in school. I live with my mom so unfortunately I got to go to through her rules and need her authorization for everything. She doesn't let me work or even socialize with friends. I never had a boyfriend and I can't go anywhere without her supervision (and of course it has to be during the day, cause at 6 it's too late for to go out). My best friends from high school invited to go to the beach on Friday during the day and ofc my mom said I can't go unless she is with me. I told her it fine like usual and then she like im sick so I hope you canceled the plans. I tried to have a mature conversation with her and ask her why she is reacting like this? And she keep saying is that "I'm defenceless and someone might kidnap me" And I wont able to go to the beach alone with my friends until im 25. Is it me or my mom is way too controlling? I can't move out because 1) Miami is very expensive 2) I don't want to leave her alone since she is very depressive all the time. How would you deal with this situation?

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