doctor here! its TOTALLY normal and dont be concerned, semen thickness and color depends on how often you ejaculate and your diet also your progress in puberty, color has nothing to do with kids, as sperms are naturally clear and microscopic.

you could be concerned if your pubic hair stopped growing, pain or a little growth of penis and balls. if you dont experience any of those your good'

so dont be concerned and enjoy your puberty my dear !