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Your mother is just looking out for you and she's probably anxious about you growing up and going out to places with guys without her constant watch ;) Talk to your mom properly and tell her how her controlling behavior makes you feel. Don't for get to remind her, "I'm EIGHTEEN." Tell her what you wrote there:
I've never had a boyfriend before because you control everything in
my life and now that I'm 18 you can't really do that.
Even if she still doesn't allow it after that, it will definitely stay on her mind and get her thinking.