Although some amount of bending/ deviation of the penis to one side is common in many people but excessive bending can also be because of a condition known as Peyronie's disease. In this there is thickening (plaque
formation) in your penis and it causes it to bend to one side, which is exaggerated when it is erect. It can even lead to pain during intercourse
. Sometimes you can feel a hard nodule on one side of your penis.
You should get your penis checked by a doctor and see if it is normal or because of Peyronie's.