How did I underdevelop? I am losing my ability to be annoyed or bothered, because I constantly feel that I understand less and less.

Sounds like you didn't socialize properly early on, were you isolated in your formative years or home schooled?

Are you aware people pick up on your emotions? We unintentionally broadcast what we're thinking and feeling with micro expressions and general body language, word choice, tone. People react to that. If you're annoyed, people pick up on the annoyance, and they're put off by the negative emotions.

I am forced to decline. Hie could I go there, when I will be alone and forced to deal with hundreds of questions why did I come alone, why didn't I bring some friend if I don't have a girlfriend or when will I have one.

Take control of those conversations, don't react to what they're saying, steer the conversation to how you want it to go. Say some good sounding bullshit. Interestingly, the way you say things matters to people more than what you actually say.

Really it just takes practice, but I think you're sabotaging yourself by giving off bad vibes. Be happy and optimistic. Be a person other people want to be around. Project the persona of a person you'd want to be around.

I highly recommend the book How to Win Friends and Influence people by Dale Carnegie.