I can’t maintain an erection during sex

I am putting myself under pressure based on previous experience. How can I break the cycle?I am 25 years old and struggle with erectile dysfunction. I can get an erection but can’t maintain it during intercourse. I have been to my doctor for tests and am relatively healthy. I think that it’s in my head; I am putting myself under pressure based on previous experience and need to break the cycle.A “cycle”, as you put it, can certainly become established after a man experien