There is a small lump on the left side of my neck directly above the collar bone, could it be cancer?

I noticed this lump about two years ago, and I brushed it off. Each day I get more and more concerned, but of course the Internet makes everyone paranoid when it comes to being diseased. Every thing I search always leads to some form of cancer. So anyways this lump is small and round and whenever I touch it, it feels sore. The left side of my neck is always really tight which is how I found the lump while rubbing my neck to relax the muscle. I am only eighteen and I feel extremely fatigued all the time. I just feel as though I am dragging myself around. Someone please give me some sort of answer, being clueless makes me livid....seriously.

*~***Background Info***~*
I have Scoliosis, and I had it surgically corrected when I was Eleven years old. My upper spine is fused so that is immobile. My back is constantly popping and crackling. I mention this because my Gram says that maybe I have a pinched nerve it my neck.

Just trying to provide as much information as possible because Cancer is not something I would love to have....)^; Tweet