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Your worst problems seem to be, in order of priority:
1. Your self image. You see yourself as boring and uninteresting, so you become it. It's a self fulfilling prophecy. Change your thought pattern!
2. Lack of self acceptance. Accept that you are an introvert and that you need alone time. It's normal, and it's in your biology, nothing you can change.
3. Bad conversationalist, nothing to say. I've lived a rather isolated life myself, but girls find what I have to say extremely interesting. That's because I've had time to learn lots of shit by reading and educating myself. Especially game. Girls love that shit since it's all about psychology. You can talk about game as long as you use normal words rather than nerdy PUA terms.
I also know EXACTLY what you mean when you say people turn their back to you when you don't make any effort. That's what it is. Just embrace it. I use it to my advantage, as I can turn people "on" or "off" like a light switch, depending on what result I want. All I need to do is to make some effort and socialize, showing interest.
Being alone is nice. Attracting people all the time can be exhausting, since people only pay attention to you as long as you GIVE something. Sometimes they give something back, and you are in a symbiosis. Other are leeches.
Being alone too long can be bad. So push yourself from time to time and choose a few people of your liking and give them some attention to gain some momentum.
I don't worry too much about losing momentum or game, because I know I can get it all back in a matter of days or weeks. So chill. Take it easy.

When it comes to my own self image, i do realise that i'm introverted. I even said so at the start of my job that i am. Thing is that despite that, i was putting a ton of effort in socialising thus making people forget i'm actually an introvert (or so it seems). If i could just slightly change the way i talk verbally, i'd probably keep or make a few more friends, i am really unstructured and boring to listen too, it's a plain fact. I am slowly changing my mindset again, i have figured out that the reason i am becoming more isolated again is because my colleagues are not the type of people i like to hang out with, it's nothing about me being anti-social, we just differ so much when it comes to life goals and interests.
I'm meeting a couple of different people now who are also introverted at my work, some who i connect with really well. We are planning to meet this weekend.
The thing that bothered me most is that before my mindset changed, i really didn't care for what result i got. I work at a callcenter and there's a ton of absolutely gorgeous girls who'd i just hit up and ask out. (meeting one on tuesday). But i'm back at square one where i DO care if i fail and that's bad.