Um. It reads like this: 'I don't like my stepdaughter, I find her irritating, we don't get on and I want her out of the house'. Fair enough. It's fine to feel this way, you cannot just magic up love for her if you don't like her. Just remember, the feeling might be very much mutual. She cannot hold conversation with you? Could it be, maybe, because she doesn't like YOU, doesn't want to talk to you and is just trying to be polite as best as she can?
Other than that.. I don't drive and don't have a licence. I don't go out 'socializing' as I'm very introverted, find all that 'socializing' tedious, draining and boring and I prefer my own company. I spend lots of time at home, because I like it this way. I'm 31.
Am I immature? I don't think so, others might, who knows. But I couldn't give a flying fuck what strangers think of my Saturday nights at home. Well yes, I do work, support myself and live on my own arse. So we're getting back to square one: she needs to find a full time employment and move out. However, her mum and she herself might think otherwise.
She doesn't have to 'go out', she can spend as much time on her phone as she likes, she doesn't have to drive, and she doesn't have to change herself according to your needs/wants. She doesn't sound immature, just introverted and there's nothing wrong with that.
You don't get to change someone, an adult person at that. What do you want her to do? Start going out? Find more friends? Spend less time on her phone? Change her voice? Become less 'me me me' for you? Why on earth should she, and how is it your business? The only thing I can understand is encouraging her to find a full-time employment and maybe getting a drivers licence. So focus on that and not her socializing habits.