Hi , well as the title say's , my problem stem's from not being able to gain an erection for a sexual intercourse.
I'm with the girl i love more than anything in the world , and we have both agreed that we would both like to have our first sexual intercourse with each other. However , when it come's to getting an erection is where it fail's.
I've noticed that i pre-come a LOT while we are snuggling and lets say getting in the mood , then when the time come's to do it , my penis is limp.
Even with the help of her , i cannot get erect in the slightest.
Although , during solo masturbation i can get hard enough for penetration , and i've noticed i will not pre-come at all , and just have a regular orgasm.
But like i said , soon as i'm in bed with my girlfriend , i pre-come a lot , then im unable to get an erection.
I'm really scared this is going to ruin my relationship.
Why am i pre-coming so much whilst with my girlfriend?
Why can i get erect during masturbation , and not pre-come and have regular orgasm ?
Why cant i get this erect when i ACTUALLY WANT TO?
What is causing this pre-come , and how can it be stopped?
Is the release of so much pre-come is what is causing my erection problem?

Please help and provide me with any information or idea's you may have , it would be very much appreciated at this moment , as i am so stressed out over this.

Thanks in advance.