I feel a tiny hard lump up my right testicle like one grain rice , near the spermatic cord i can't know exactly ? is that normal ? or may be a cancer?

Male Anatomy: As mentioned in the previous answer this is fully normal. It is not cancer.

Not normal: Masses in the scrotum are common, but need evaluation by a urologist before you make any decisions about their significance. And, yes, it could be cancer.

Scrotal pearl: Not exactly normal, but almost certainly benign. Scrotal pearls are tiny hard masses, usually size of grain of rice, occasionally larger & end result of calcification of a sloughed appendix testis or appendix epididymis. U may have had episode of scotal pain when such structure twisted & then went away on its own. Still worth scrotal ultrasound to make sure.