i have a possible case of erictile dysfunction?

[Dennis]

i have a possible case of erectile dysfunction. i usually have no problem becoming erect but i have had a frustrating and rather embarrassing is issue. not to long ago i was with a girl who wanted have sex with me. but i could not get hard. i thought this was only a fluke untill today, when i was unable to get/maintain an erection, at one point i went flacid while in the girls mouth. i masturebate regulary and have no problems there. so i am very woried about why when i am in actual sexual situations, i cant get/stay erect. i am if that helps