A girl never contacts you. I take the initiative to chat. She didn't reply to this message. Is it necessary to send another message? I am introverted and a little autistic.

It means that you haven't attracted her attention, which means that she doesn't like you, and you are just a passer-by to her.

If you like her, you can try to have more contact with her. If you can successfully get her attention, then you are chatting with her and she will probably reply to you. Further, make her interested in you, and she will take the initiative to chat with you. Then you can naturally ask her out for dinner, shopping and watching movies.

If you are introverted, either change yourself or make yourself excellent. Or give up chasing girls, depending on which one you choose.