I think emotional availability is like a bank account - somebody has to make deposits in you before other people can get some from you. Your friends are making deposits right now by helping you with a place to live, but that doesn't mean those "funds" are available to be withdrawn by others! A therapist can make deposits. I think it takes a while - it is for me.

it isn't really resentment - it's just that I don't have it to give.