Just as prefabsprout explains, introversion and extroversion have very specific definitions in the social sciences. It is not offensive to call people introverts, just as it is not offensive to call people red heads or to call people short. They ar accurate descriptors. Some people may prefer tall partners or brunette partners, but that does not make it offensive to point out that some people are not tall or not brunette. There are those out there who prefer every kind of type; you just have to find one person who likes your type. The actual problem you are having, once again, is your own distorted thinking and inability to either accept yourself as you are or make desired changes. That is something you need therapy for, because you keep going around in circles.

It would also be helpful to know why you are 28 and living with your parents? That may point to other issues you have in terms of motivation, disability, fear, etc.