Okay, lets get the reality: penile cancer for someone of your age, without long-standing symptoms is simply unheard of - end of!
Have you been masturbating recently? What this most looks like is an escape of blood from one of the many fine sized veins that exist in the penis. This can occur when you go at it a bit harder than usual when you are masturbating - and is often experienced by men using penis developers and pumps.
It is your general health that is in question, particularly the pains in the chest - yes this can be linked to both stress and tiredness - but I would suggest you at least discuss this with other family members, or close others that you trust. If uncertainties exist, or if the pain becomes severe you should seek medical help or go a Hospital Emergency or Walk-In Centre …