Deep Anal Pain

Hi Sam,

I am a new faggot. I have recently discovered how much I love serving real men and in particular Straight Alphas. Most of the men I serve are straight, married or in relationship with women and I just love that I provide them what they can't get from their girls while I get complete humiliation and degradation for being a faggot. For most of this time I have been a cocksucker to them but I decided I want to please men with my ass as well. Straight men love my ass, it's very thick and girl-like so I understood it's my duty to let them fuck it if they want. I have been fucked 4 times now but I have a problem with pain when men thrust deep inside it. I have no problem when they stick their cocks in, the problem is when they reach deep and thrust hard. Why am I in pain at that spot? Could it be anatomical like a bowel curve? I had a colonoscopy, so I know it's nothing serious but still I don't know what it is and how to deal with it. And to be honest I don't want to give up anal because I feel like a total faggot slut. But also I don't want to hurt a lot. Also, I always use lube. Any ideas?