I am normal in straight sex. But in homosex when I put my erected dick’s tip on the asshole. My mind starts the excitment of taking dick in the hole due to which my own asshole starts tickling. The tickling affects on my dick and it lose erection immediately. But on the other hand when I get a dick in my asshole I feel excitement and the excitement affect to my dick and it becomes Iron rod and during fucking when my fucker give strokes in speed, meanwhile in the speedy strokes my dick get ejaculate. IS IT WEAKNESS OR MY PSYCHOLOGY?

It just means that you get more excited being penetrated.
Perhaps maybe you`re a total " Bottom " ?

bottom! did someone say bottom? i need a bottom!