Help with bony " hump" or vertebrae sticking out of the back of my neck..

Hello, I discovered like a month ago what appears to be a bony hump or vertebrae sticking out on the back of my neck. I found it because I've been experiencing back pain so I took a mirror and I discovered the bone sticking out. Funny thing, I don't feel neck pain but I don't know why I have this..

I believe this appeared as I spend a lot of time in front of the computer, so this looks like posture related. I also don't go outside a lot and I guess I'm lacking some vitamin D. I just started taking like a month ago 10.000u of vitamin D daily, and I plan to start taking a calcium supplement because I don't like dairy products.

What do you think the cause of my problem is? bad posture, lack of vitamin D- calcium? Are there any neck or back exercises I could follow? Is there any device that could help me get rid of this? I'm very concerned..

Thanks a lot for all your help!

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