ED when having very strong sexual arousal

I have ED when having very strong sexual arousal. I have no idea if the reasons for this are psychological or physiological. Since my teen years when I get very strong sexual arousal the erection disappears, it's like my sexual function gets shut down completely when it reaches some point of arousal. I also experience the body tremor then. When arousal is not very strong I can get hard and maintain the erection for a long time (for example when kissing a girl). Initially I thought it's pure psychology, like performance anxiety, but it used to happen me with real women, but also when watching porn alone too. I somehow doubt it might be porn induced, because I used to get this even before I ever watched porn, but it might be related with anxiety as my first sexual experiences were watching the erotic movies on TV and I was afraid of being caught when doing this, so for me sex might be associated with anxiety, shame and unsafety.

Wondering does anyone here has similar experiences.