What is the treatment for erectile dysfunction?

Hi doctor,

I am a 17-year-old male. I eat around 4000 calories a day, meet all my macro and vitamin requirements, and drink 2.5 liters a day. I do not smoke, drink alcohol, or take drugs or any medications besides Amitriptyline. My query is about erectile dysfunction. I have had erectile dysfunction for almost a year now. I do not wake up with morning erections, and I cannot get a full erection at any moment with any amount of stimulation. I have had my blood and hormones tested, and everything came back normal. I have pretty good mental health, relatively normal stress and anxiety, and I am happy with my life aside from this, which is starting to severely affect my mood, as I have a girlfriend, and we are almost at the stage where we will want to have sex, but I cannot due to this issue.

I used to masturbate a lot before my relationship, multiple times a day and at least seven times a week, for over a year. I stopped this routine a few months ago, and the last time I masturbated was two weeks ago, and I have not seen any improvement.

I am not sure if this is related, so do not worry about this too much. I also have to force pee out occasionally, which might be normal, but I have to squeeze and let go multiple times to empty my bladder. I have talked to my doctor, and we are not sure where to go with the next steps. What should I do?

Thanks.