Well first off, have you seen your Dr. about this? I think he or she would want to examine you before rendering any judgment on whether there's anything to worry about. Often there are fairly significant differences in appearance of individuals' genitals & its' easy to convince ourselves something's wrong, when really it's just part of the normal variation. I would start there. I really don't know from your description of 'twisted veins' exactly what you're talking about or what it looks like, and again, even a Dr. would want to actually see you. See your Dr. & then check back in here & let us know what's said...