Spirit Guides And Demons

As of late, I've really felt like I need to contact my spirit guide, but never have before. I've always been sensitive to the point I can tell if there are entities/energies around me and get a "feel" for them as to what they are like/what their intentions may be and how powerful they are, however, late last year some strange things happened and now I'm left hanging and confused.

Late last year, a friend wanted me to put on a rosary that was blessed by the pope for protection but it felt extremely cold around my neck and only got worse. When I told them what was happening, they said to take it off and that it means I have something to do with something dark. Right before I fell asleep that night, she came to me. She said her name is Lilith and that she chose me for a reason and I am marked by her. We talked a bit but it was somewhat cryptic and I had originally made the mistake of trying to think it was all in my head and I was just crazy, so I can't remember much of the conversation other than that. She came again a few days later, mostly to assure me she was real and not in my head. She does not seem "bad" she seems somewhere between good and neutral if anything really. She's very pretty, and has a kind of serene and regal air to her. Would she be my spirit guide? She has helped me with things in the past, but I'm not sure if this would be a different circumstance because I'm marked by her.

Also, while I was doing some research on her, I found that people used to think that if a child laughed in their sleep, that meant Lilith was present. I bring this up because when I was young, I used to have these "episodes" in the middle of the night. I would wake up in the middle of the night shaking uncontrollably and laughing. In the morning I couldn't remember anything but my mom would tell me about it. I think maybe that might have been when she originally marked me?

What do you guys think? Any input would be greatly appreciated, and if anyone else has been told they are marked by a demon I would love to hear about your experience as I haven't found anything online about it at all as of yet. Thank you.