About the Penis. Or something else.

Please give a detailed answer. I have some concern about my penis and ejaculation. My penis size is 6 inches and average in circumference. I do masturbate by watching porn, generally 3-4 times in a week, it gives me immense pleasure while masturbating. I want to ask that is my Penis size is ok or good and also my penis is also not straight (i.e. bend on left side) slightly so is that ok with my penis. While i masturbate by watching porn, by the process of jerking and stopping for some time i remain erected for 45 minutes and then ejaculate but when i don't watch porn and masturbate then in 2-3 minutes i ejaculate generally. As i will be having sex with my girlfriend in coming 2-3 days and i want to make a good impression on her so how much time will i be taking to ejaculate while having sex. My main concern is that, earlier i used to masturbate with my left hand and now my left chest is smaller in size as compared to the right one. So is that because of masturbation or something else.