My penis is a little curved to the left side and at the shaft, but I have no pain during erections?

May be just fine! Many men have different curvatures and orientations of the penis. One may consider whether to get it check out. Peyronies disease is a common condition that may require some intervention. Just because you do not have pain does not mean you do not have a significant problem or one that will worsen. Use common sense and if in doubt, get it checked out!