I have a small bump on the back of my neck near where the spine starts. It's like a little pimple and hard but is not red. Could it be a node?

Lymph nodes. Am supposing that is what you mean. Yes, it could be a lymph node, or any of a dozen or more other things. Go and get this looked at by a professional if it persists and bothers you. Good luck.
Possibly but likely. In this location it could be a lymph node or it could be a sebaceous cyst or hair cyst, .