Evry time I wank a clear and runny liquid squrts out is it cum and why isit thin and runny
When a guy first starts to produce ejaculate it is fairly 'clear and runny', but I suspect that your observation is more likely to be from the fact that you are young and wanking frequently. And your body doesn't have time to produce enough to be anything else but 'clear and runny'. If you give your system a rest for a day or two... or three... the appearance will change.
But there is nothing wrong with you.
Most likely because you are masturbating a lot as bimjob mentioned. Your body doesn't have time to produce anything else.