Dear
Welcome to HCM
We understand your concerns
I went through your details. Please understand,
masturbation is normal and natural. Masturbation cannot harm your health in any way directly. More over masturbation will not be the cause of your semen thickness. I suggest you to restart masturbation and read many articles about masturbation because you are anxious about the whole process and your knowledge is far too less.
The color, volume, and thickness of semen may change due to so many factors. The standard mean ejaculate volume for testing is 3.7ml, and it's considered normal even if it's below 1.5ml.
Stress,
anxiety, low water intake, outside temperature etc can make your semen less watery. Therefore, please stop worrying about this and concentrate on your education and career.
If you require more of my help in this aspect, please use this URL. http://goo.gl/aYW2pR. Make sure that you include every minute details possible.
Hope this answers your query. Available for further clarifications.
Good luck. Take care.