In highschool, when a matured girl thinks you're immatured, do you still have a chance?

Anonymous
So I know a girl very well at the beginning of the year but when I was about to become her good friend I think I acted too immature in class with my guy friends (health class and we comment on sex). I think she's uncomfortable and have been avoiding me this past 2 weeks. How do I show her that I care? What's a specific sentence that has proven to be successful for apologizing to girls?
In highschool, when a matured girl thinks you're immatured, do you still have a chance?
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