I'm a 25 year old male, very healthy, exercise regularly.
Been having erection problems since the end of 2012.
I started masturbating when I was around 11 or 12, would do it prone rubbing against the bed, stopped that though in 2012 when the problems started.
Started masturbating to porn very late, when I was 16 or older, was never a heavy porn user except for a few brief periods of my life, followed by other periods of stopping porn completely. I have finally quit porn for good earlier this year.
What happened is that till like spring or summer 2012, I could go in the shower, fantasize about a girl, get full hard without even touching myself and then proceed to rub to orgasm. I could also get full hard just by rubbing to make it easier to shave.

I started to notice the problems when I first got sexually active with my girlfriend late 2012, when we make out I could get full hard easy at first, when she gave me oral in the car I would stay hard for like 15 - 30 minutes before ejaculating, but if she stopped for a while I would start getting soft, it wasn't a problem at first since I could get back hard as soon as we started touching again.

I then noticed that I can no longer get hard without touching myself, and it was getting difficult to get hard by touching my penis, sometimes when I tried too much I could ejaculate when I am very soft, only way I get hard was either by masturbating to porn (I masturbated through my clothes in that phase, never any skin to skin contact) or by touching my girlfriend.

needless to say the morning erections were completely gone

then I passed through a brief period of premature ejaculation where I would ejaculate the moment my girlfriend's mouth touched my penis then I returned back to normal but my erections got worse, to the point that if I used porn to get hard and went to the bathroom to masturbate my penis would keep going soft on my way, and when I take it out and start touching it, it shrinks as a response to contact with my skin, another thing I noticed is that I never got full hard, only 3/4 hard.

Then there was my first time in bed with my girlfriend, we were both virgins, I was hard when we were both dressed, she took her clothes off and I was still hard.. then when I took my pants and underwear off I immediately got soft, no matter what we did I couldn't get it up, I would get only 1/4 hard if she performed oral on me but once I was out of her mouth I would go back soft.

After that incident I noticed I could get hard touching myself through my clothes but once I take them off I go soft immediately.

I stopped all porn at that point, and tried to stop masturbating, but I had developed the habit of having a hand casually touching my penis through my clothes when I'm sitting at home, I cut down the daily ejaculation though to once every 7 to 14 days..

Been doing this for 3 months now.. Saw slight improvement , got a few spontaneous erections in those months, a couple of them I was full hard, not for too long though. the morning erections are "almost" returning, sometimes I wake up, and if I think about why I am not having a morning erection or concentrate on my penis a little I would get an erection, 3/4 hard, not the typical waking up at full mast but it is an improvement, most days I wake up soft though..

just a note though,, those spontaneous erections and "almost" morning erections are very few, and are less than the normal of my age

I still can't get hard when I need to, like when a girl flashes me or when I see something sexy..

I do not use any kind of medications and do not suffer from any kind of illnesses

I need to know what should I do from this point on, how long would it take me to get back to my normal old self, what do I need to do to get there?

Thank you