I’m not sure I agree here. This sounds like the words of somebody who could be called an ambivert. This means somebody who rides the line between introvert and extrovert, never fitting exactly into either category. Personally I’m strongly introverted.
I’d agree that entirely isolating yourself is not the best way to go, but that doesn’t change the fact that social situations will always deplete my energy over time. That without significant time alone and to myself I will become very stressed and unhappy. It’s not an issue of confidence for me, I work as a manager in retail and am comfortable dealing with everything from staff to obnoxious complaining customers. It’s just that being around people doesn’t ‘give me energy’ being alone in solitude does. Given the choice between a quiet walk alone in a forest, or a lively party, there is absolutely no doubt which I prefer. One sounds like a wonderful experience, the other sounds like a wasted and draining night. I also know others who talk about being alone in exactly the same ways that I feel about being with people. It’s not a limitation, it’s part of our ‘true identities’ if such a thing exists. Whether I’m labelled an introvert, an extrovert or a flying monkey. It won’t change how I feel about being around people. It’s something to be done and enjoyed in moderation.
It’s not just about how much you enjoy being around people, but also involves how you like to interact with them. I have zero, even negative interest in socializing when that means talking for the sake of talking for example. I seek deeper more meaningful connections to people I respect, I’d prefer to be entirely alone than with people who feel shallow, by a very large margin. I do have to admit that I tend not to seek contact with people as often as I probably should, because I don’t feel a compulsion to do so. I don’t suffer for being alone. That can mean missing out on getting to know some cool people or making them think I want to be left alone / don’t want to talk to them, but I’m getting off topic here.
Coming back to the topic a bit, it depends a lot on why you are feeling unsocial. There can be many reasons and it doesn’t have to be introversion. If you are scared of people in some way (and many many people are, I think most people have some level of agoraphobia at some time in their life.) then you will get tense being around people, which will have the effect of draining you and making you feel very uncomfortable and afraid to act. It’s different to being introverted, it’s being paralysed by fear. If that’s the case then I can definitely see lucid dreaming being useful in dispelling that fear. In that case though, it’s not strictly changing your personality, as much as releasing fears so you can act more naturally.
I once did an improvised version of peter kay’s sequence to the song Amarillo in the middle of a club filled with mostly people aged 40-75, who played the song only because they were from that era and liked it. It didn’t change my personality. I wasn’t drunk and I was the only one doing it. Another person tried to start, but didn’t know the sequence very well. It was something I would never normally do and I did just to see how it would feel, for a laugh and to see if I could actually do it. I’ve always been ‘shy’ such a public performance is dramatically out of character.
Probably since I was used to sensing or feeling nothing in solitude 
Just my crazy little theory.
I would litterally feel drained or irritated in the presence of a bunch other people after being alone for a while. Guess its introvert season. 
