Hello. I'm 16 and had hypospadias when I was a baby. My problem is I cannot ejaculate when I masturbate. What is wrong with me?

There is not enough information in the question to provide a comprehensive answer. Your best bet is to see a urologist who will examine you for any problems that may be related to the surgery to correct your hypospadias. ---- I agree. I assume you have been urinating normally, so your urethra must be working OK. You don't say whether you have an orgasm or not. If you cannot reach orgasm the problem may not be physical at all.