What should i do (only for girls)

I want to ask this question to every girl. I’m an extrovert, but when it comes to talking to girls, I don’t know why I get so scared. I mean, I want to approach them, but I just can’t. I have no idea how to start a conversation. I’m afraid they might slap me or call someone, saying, "He’s harassing me." The thing is, I never intend to make anyone uncomfortable or harass them, but I’m scared that a girl might feel that way because of me. So, I need advice from girls on how to talk or approach a girl properly without making them feel awkward or unsafe. Please help!