Look on your shoes.
It depends on your age. If you are just staring to masturbate, it may be that you are able to orgasm but not yet ejaculate. If you know you are already able to ejaculate and this happens more than the odd one off occasion then get it checked out. I'm not an expert on this, but I read somewhere that the sperm could be going into the bladder instead of out of the penis.
I agree with that last person about going to your doctor.. but also, do you see your cum after you do it? Or do you not feel or see it?
Yea, I saw the cum, I didn't feel it leave me though.
you might have a numb penis.
When I jerked off the first time, I felt a great intense
orgasmic feeling as I cummed on my white cotton briefs.