Without knowing your Current Stats, plus Diet and Training, hard to say why you aren't getting the results you desire.
But off the Top of my Head, 300 Mg a week isn't an Optimum Cycle, even for a Beginner.
500 Mg would have been a much Better Starting Point.
Also, if you are getting Water Retention, you are either not taking an AI, not taking enough.
Or your AI is Bogus.
But again, without the Details, can't give you an appropriate answer....................... JP
P.S.
I can tell you this, my 1st Cycle was 500 Mg of Test C, and I made some Great Gains.
But I had been Seriously Training Natty for 8 years.