you are completely fine, dont stress over it. It is very common and if im not mistaken its from masturbation. However as bobdylan1958 said, if it becomes a problem then see a doctor
Hi there 85% of men/boys has some kind of curve with there Penis and have no problems , How ever if it is causing problem's please see you local Dr he/she will send you to a Urologist there you will get all the help you need , Take care ,