You refer to having sex -
with a condom which is as it certainly should be in your situation - and a "blow-job".
What is missing - is what
you do to pleasure your girlfriend? Or do you think they enjoy simply being penetrated?
I suspect - I certainly
hope - you know about the clitoris. If you do, you
should realise the "rules" about using it, and particularly the one that states that it is
very sensitive, and must be touched only using lubrication.
And that quite simply, is the secret about your glans - it is - as it is
supposed to be - sensitive to the extent that it is suited only to touch when lubricated.
Personally, I advise avoiding websites which advise imitation if circumcision, such as wandering around with your foreskin retracted. Just
why you would want to emulate a circumcised man, I cannot fathom but perhaps it is the "mystery of the unknown".
Presumably the first girlfriend had certain pre-conceived (sic.) notions about male penes being naturally "tougher" and relatively insensitive compared to her own clitoris. From where? Experience with circumcised men? "Education" from porn?
This is an all-too-common question, I am forever answering it anew. Read some of the previous posts:
{1},
{2},
{3}, and the
discussion behind that,
{4},
{5},
{6} or simply
go through the search!