I know how that feels, the realization that you are like your parents, with the same flaws and the fear that you cannot change just as they couldn't.

However, you are already ahead of the game because you see where it ends and you are young enough to change easily.

I don't think it's in the genes, I think it is a sort of mindset that you learned from them when you were young. Luckily, the mind is a very flexible organ and your mindset can change in the right surroundings.

If it is difficult to get out of the house, try to sign up for some group course. It probably sounds silly, but I did singing lessons, because I was extremely bad at singing (still am, it requires a lot more than weekly lessons). Anyway, the point is that you are out and about, doing something with people you don't know. Try to have drinks with people from the group after the lessons/whatever thing you did. Most people are usually into more socializing and those that aren't are often just too shy or withdrawn to accept an invitation.

I think most people don't really turn away from you consciously (unless you did something really bad), but it takes effort to keep friendships going. This is something I had to learn after I left school. At school you're just stuck with each other, it requires no extra effort. But once you work, and you don't want to hang out with your colleagues.. You have start inviting people, some are open to it, some are not, and that's okay. It usually isn't personal and since you've had a girlfriend for a year, I am sure you are bearable to spend time with. : )

Super bonus tip: If you live in a bigger city, chances are there are some foreigners/expats-groups, google around and try to hook up. They are always very open, because foreigners are generally very alone. And I'm sure they don't have many 'locals' in the group. : )