I am really sad. I am talking to this girl, but I think she does not want to talk back to me. She replies to my messages late and whenever I ask why is she not replying she would say she was busy.

I really want to talk to her as I have no real friend and I think she is ignoring me because of past experiences. I really need someone to share this with and am very desperate to talk to her. She thinks I am immature, but I am not. Someone please help me.