Why do I have really visible veins under my eyes?

Under my right eye in particular I have very visible blue veins under my eyes. They don't bulge like varicose veins and they aren't really thin and tiny like spider veins. My parents don't have them either and I am only 19 so it's kind of freaking me out plus it isn't exactly attractive. I also don't smoke or do anything bad for my health that would cause that to happen. Could it be eye strain maybe?