<human>: So I grew up in an extremely religious family. Never had sex before, and believe it or not, I ever so rarely watched porn. I think my sexual libido is like the minimum. 

Anyway started a relationship with an awesome girl about a year ago and its going great. She's from a very similar culture (that's how we met), so I'm sure she's a virgin too.

As our relationship progresses, we started even talking about getting engaged to each other. I love her more than anyone and would want to please her and spend the rest of my life with her, but I am extremely afraid of sex.

The thing is, I'm not sure if I am able to have sex with anyone. This might be funny or shocking to most people, but its extremely worrying for me. What if I never get an erection? What if she thinks I don't find her hot? I'm not sure how an inexperienced girl like her would get me erected, specially since no other person was able to (no one tried lol). 

I think there is something wrong with me, I just don't have an urge for sexual stuff, maybe because I never had any experience, maybe because I'm afraid I'll fail (or not do good, or simply not have an erection during) or maybe because I'm sick in another way. Even watching porn doesn't get me that excited honestly. I've never looked at a woman (or a man) and thought "I wish I can fuck that". It just seems the furthest thing from my mind.

I'm now in a time in my relationship where we should be doing some physical stuff, my girl friend is shyly hitting to it and I'm just postponing because I'm scared shitless.

I have no idea what I should do. Just go all in and try to have sex? What happens if I cant get it up?

Or should I talk to a doctor? or something?

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Never had sexual experience before. Want to have sexual experience now, afraid shitless that I will not get an erection and be terrible.