I Am 17 Year Old I Had Habit Of Shaking

I am 17 year old i had habit of shaking my penis and cum today also I was shaking my penis and watching hot video. At the ending when I was going to cum I saw my penis was starting bleeding I look down to my penis I got shock very badly shock I suddenly stopped and start cleaning my penis with water. I was badly scared After cleaning my penis I can't find from where it was bleeding after some minutes thinking I thought might be the blood was coming from inside my body. :(

Is there very big problem is in my body or something happened in my body plz doctor what happened to my penis ??? Is there a big problem to my further life give solution