I would consider myself a closed-off person for the reason that I consider the masses to be the walking dead, inasmuch as they don't seem to have a clue about this World, about life, about extraterrestrial life, what is important in life (that being spirituality), etc., etc.

Thus, I feel like I have nothing in common with people, especially having to listen to their mundane stories about nothing that matters. I am quickly bored almost to tears.

They want to go on and on about the political parties, as if one puppet party is better than another, about religion preaching love but waging war in the same breath, etc.

In other words, I have closed myself off because I reject all the BS coming at us from every direction, including from other people. I am happier being alone and educating my mind about this World, rather than listening to (c)Rap, talking about some politician or celebrity, discussing the latest (crap) TV show or movie, etc.

If you want to discuss spirituality (not religion), extraterrestrials, life in the Higher Dimensions, the End Times of this Human experiment that we call "life", etc., I will be an eager participant.

Sorry, this is probably not what you mean by the closed-off person you are describing.