Many women can not have an orgasm from intercourse no matter what the size of her partners penis is. This is not uncommon at all. I agree with the above poster. There are several other ways to please your wife. There's no way you should even let suicide enter your mind because of this.
There are other ways to fullfil your wife,stroking her clitoris arouses enough to give her orgasm.she can even be on top of u in bed,and rub your erect penis to her clitoris,she can orgasm from that.