I hit my head pretty hard and now I have a bump can it be more severe than what I think it is?

While at work I was gonna. Walk to the restroom where we have a metal box where we put our specimens in law I was looking down and hit headfirst into the metal box after a few minutes I felt tenderness and a small bump started showing you would have to touch it to know it's there it's very tender my head hurts just on that one side it's right where my hairline and four head meat on my left side now I read stories that if you bump your head no matter how minor it could lead to bleeding should I worry i've heard that if you get a bump that means that the outside of the skull took most of them impact does anybody know how true that is and it was pretty hard because I was kwalking very fast