"The thing is, do you, your issues and life dominate the conversation when you are together?"
(Big) IF that is true other comments might be not unreasonable in your post, Dione
"You sound pretty needy to me,"
seemed quite the opposite to me...
"you have a lot of problems with your family"
I'm not sure whether anyone would be able to 'not have problems' if mother was a bit of a bitch, and father does nothing but roll over and accept the views of "she who must be obeyed".
I'll have to go back to see if I have missed siblings, but felt sure I had a moderate understanding of OP's situation, family wise.
"by the sounds of it his family are kind and supportive when you are with them."
Indeed, but unless OP's needs dominate, then she sounds quite reasonable in wanting to be with her partner and not packed off (by him) to visit her parents. If anyone is needy, it seems to be him, unable to 'share' - unwilling for the OP to get to know his friends better, or have more opportunities to stay with his parents, as if she's a threat to him, as if he'd lose his friends or parents 'to her'.
As for OP having her own friends, I guess up to a point as an academic, it may be that bit harder to make friends, esp if not currently working.
She's unlikely to meet 'competitors' (ie staff in post) in social gatherings, may not be interested in drunken parties at weekends as many other single women in their mid-30s might be, and OP probably has better things to do than 'loiter' at the gym or library to see if she can make friends with others around her age group, let alone interests (not knowing her academic interests leaves us a bit in the dark).
Sorry, OP, to be 'discussing you' like this, but I know how some people are perfectly happy with their own company and are not "needy" or weighing down any acquaintances with their own family concerns or burdens.