Erectile trouble at 24 with women my age

Doctor good evening, I am a 24 year old guy, I have been living with a girl for 7 years, for some years things have not been going very well for us and I started dating other girls at the same time. I cannot have and maintain an erection with all the girls I go out with, but only with those older than me (I speak from 30 to go up). When I go out with my peers, I already know that, having arrived at the end of the evening, I will fail or if after several attempts I can get an erection I cannot maintain it over time and perform well. I have already visited 3 andrologists, no one has found any problems with the apparatus (with related blood tests), some have recommended Viagra, others Total Argin, but I don’t want to depend on a drug, I ask for your help and the thank you in advance, thanks for your time.