I feel that I don't orgasm (and can't ejaculate) anymore. Is that normal?

Hi,

I am a bit confused (worried too) and need some help. So here is my story:

I am 33, single and a South Asian male. I don't drink or smoke either and I am a lacto-vegetarian. I have never been married or had any relationship with any girl before, mainly because I wasn't mentally ready until about a year ago. So, I got into a steady relationship and we are thinking about getting married as early as next year too.

PAST: I used to watch a bit of porn once or twice a month for few minutes and every time I could ejaculate (a TRANSLUCENT/MILKY colored fluid) and a good amount. I used to get erect properly too and the foreskin would completely stretch out with each erection too. The last few time when I watched porn, I felt a pinching pain in my penis which was one of the reasons I stopped watching porn. I don't remember when was the last time I masturbated.

PRESENT: But now, none of that happens. We recently started getting intimate and I have been noticing that every time we are together, I can only ooze out a small amount of TRANSPARENT and sticky fluid from my penis. I don't feel fully erect. Another reason why I think that is that the foreskin doesn't stretch entirely either, like it used to before. And of course there is no ejaculation. Although, my girlfriend is quite supportive but now I don't want to be a huge disappointment altogether in bed. Now when I try to masturbate, generally nothing happens but occasionally I get a drop of that TRANSPARENT fluid.

Health Condition:

I am averagely built but do have a layer of fat all around my belly.
I am not diabetic but this past May I was diagnosed as pre-diabetic.
I am not a lot into working out, sports etc. and exercise randomly. Although, I do feel that I used to be extremely more active in my school days than now.
I do feel stressed out at work but this issue is stressing me out way more than my work now for the same reason I mentioned above. I do love her dearly and want to make sure she is fully satisfied and we can have be a normal family.

Now, here are the questions that I am looking answers for: