Seems like you aren't ready for a cycle yet. Few things:
At 150 lbs, you have a lot more room for natural growth.
At 20 years old, your test levels should be high enough to grow if you eat enough and train hard enough.
You didn't list a good PCT. Typically one would use a SERM and natural test booster in PCT and then add in an AI 2 weeks after starting your post cycle.
You bought a product but didn't research dosing.
You are asking if it is okay to use protein on cycle.
What is your diet?
What is your training program?
Bottom line is, don't do a cycle right now. Do a lot more research, eat more food to gain and train hard for at least another year before you even consider running a cycle.