Bump at the top middle of my chest?

Well, I am getting worried now because two people have asked me if there was a problem because there is a bump on my chest in the middle but it doesn't hurt and I think it's always been there but when I feel it, I feel my bones but with a bump, maybe my bones, formed wrongly, l don't know. The thing is it's only noticable if a person gets really close and the top of my chest is bear, should I be worried?