If you have long fingers you have long penis?

Not related. There are plenty of such myths. Many women believe that penile size is related to size of feet, also untrue. By and large taller and bigger men may have larger penises than slight and small men. Achondroplastic dwarfs (little people with very short arms and legs) have same size penises as men of normal stature.
No. No correlation. Just a myth as with correlating shoe size to length of penis.