I was in a lot of pain as a child due to a problem with my legs. From age 2 I had to have extensive physiotherapy and I have been told I used to "space out" and not respond if spoken to although I would comply with any directions I was given. So I guess I have had the ability to block out pain for as long as I can remember.
I do feel pain though, if I can't focus then I think I feel it in the same way as anyone else.
For example headaches can catch me unawares and it can sometimes take a fair while to be able to bring the pain down to bearable levels.
Cutting my self when I am using a knife hurts and having to cope with stopping any blood flow means I can't concentrate on getting rid of the resulting pain.
Whether I have a higher pain threshold, I don't know all I can say is that pricking my finger to test my blood can sometimes hurt like blazes.