I'm the same, mine split 6/7 years ago. For me, its an issue with trust, and I feel as though I can't trust or get close to people because it won't last and they will just go off and leave me... until about 2 years ago, I was very like you. Had a few close friends, and that was it, after I left school I wasn't bothered about missing them. Then I started college and met loads of special people and we broke down barriers... so, even though it is taking you longer it doesn't mean that you're always going to be alone. Having said that, I find it loads easier to connect with people who have been through similar stuff, all but one of my best friends, and my boyfriend, come from divorced families.
You don't sound moany or whatever, you sound normal. I think marital breakups always affect people in different ways, even the people who make out it hasn't. When you get to uni just go for it, you've got nothing to loose and people are always gonna understand if you say you're scared of rejection and explain why... you're not gonna become your parents, you've got your own life, just because they had a bad relationship it doesn't mean you will.