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In that case gjdm. Get some pics up brah.

 

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For arm size frequency is the key...i have noticed in the last month

 

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my arms are 15", im 158 lb OP and only been training for 3-4 months.. so idk if your arms aare good

 

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I will soon bro, hopefully later today or tomorrow

 

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Judging by your picture you build is different to mine. Your arms would have been naturally bigger then mine. When i started i was a stick.

 

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when i started i was 135 lb

 

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Considering you said you had been going to the gym for 7 months and have a 12kg gain, tends to lead me to believe you have gained a lot of fat.
That's 3.7lbs per month. That's a lot and not necessarily a good thing.