How do I tell my parents that I have a boyfriend?

DiNoOoOo
I’m a 15 year old girl who recently got a boyfriend. They see me as immature and don’t think I’m ready for a relationship, especially when I keep it a secret from them. I really REALLY like this boy and want to be with him. I want to tell my parents but I’m afraid.. what if they won’t let me hangout with him? I don’t want anything to change. So how do I maturely tell them?
How do I tell my parents that I have a boyfriend?
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