A downward curve has presented no problem for me. When erect and hard it is usually straight away; but a downward curve without a major bend can be a benefit. Just think, a large penis filled with blood can certainly carry plenty of weight. Thus a nice curve.
No problem. Now, if it is curved to the point that entry for sexual activity is a problem, then see a Doctor.
Otherwise enjoy the feelings.
As some have also stated, it also can be an aid during oral activities.
Enjoy what you have.