Thanks for your query.Based on facts that you have posted It appears to me that you have got Phimosis
.Does the curvature of your Penis is noticed only after erection ? Since how long you have noticed this ?Bending of the penis on one side occurs due to discrepancy of the Tunica Albuginea
which is envelop of Corpora Cavernosa of Penis. .This can be confirmed only on clinical examination.So please consult some Urologist
for clinical examination and to determine the extent of bent.If it is noticeable and hinders the sexual act then it will have to be corrected by surgery which will be performed by Urologist.
For hard foreskin and Phimosis you have to get circumcised.Both the surgeries can be done in one sitting.