How did you start fapping?

OMG I just fapped and there was a little blood in my jizz! OMFG AM I DEAD!!??????

It's nothing to be alarmed about it blood rarely comes out with it. I say that, because it shouldn't be something common. If it does happen once, but never again, you're fine. If it happens quite often, go to a doctor. There can be a number of problems that this could signify, such as urinary tract infection, prostate/testicular/bladder cancer, STDs, etc.

If it happens once or so, it's probably caused by irritation, or even a popped blood vessel (be careful when handling your member please!)

So, you're not dead if you jizzed a small amount of blood. If it was an alarming amount, and you've had multiple episodes of said problem, then I advise you go to a doctor immediately and get yourself checked.