hey Paul what a co-incidence same name dude, First you need to calm down, you really don't need any medicinal help, you are just fine .. Let me explain things in details..
You are porn addict, what you see in porn caught your interest so much that you always want to see those things even in real life, so real life is a little different unless until you have unbelievable understanding you can not create such environments.
First thing you need is time, don't really jump for sex, give some time so you can normalize your self, and have enough time to tell your girl what you are looking for.
try to communicate sexy chats as much as possible with her, and last do not masturbate try holding things and you will start seeing the magic.
theres your problem 2-5 times a day with porn mb,
As you have stopped the negative activities, it is likely that your natural virility will reappear. To hasten the recovery, you may do, Abdiminal breathing, male deer exercise, Sat kriya, You may google these words and learn the techniques and practice. You are young and will become normal with exercises, general health care and keeping up good morale.You may research and sufr in MH. there are many good techniques, suggested in other posts.