I’m 18 mate, how come you asked?
I asked to gather why you have such misconceptions ;) (no offense)
I was the same when I was your age. Also about your size BPEL.
It is already very big and you wont see many girls who have seen bigger dicks.
Regarding your bulge. Its the equivalent of female breasts. You have a big dick so it will show in many situations.
Its hard to hide like its hard to hide big breats.
I was very concious about it and tried to hide it. Now Im secure about who and what I am.
You are a man and you have a penis. period.
If an insecure girl talks shit about my bulge I stay within myself.
If she gets vocal about it you tell her:” I am not excited and this is my flaccid male sexual organ. If you are that interested you can check it out yourself”
or:” If I was excited/hard it would look different..imagine tent..”
or if she has big boobs: “yeah you know, big things are hard to hide..”
Just play with your tone …flirting or dead serious(contextual). Most girls focusing on it simply want it.