Hello Zdarlite: Honestly, I don't know what to tell you about this.

I have often felt this way. I've always been a pretty self-centered person.

In my case, I've sometimes wondered if it had something to do with having been an only child. Or perhaps it had to do with some of the abuse I suffered along the way.

I don't really know.

There's probably a personality disorder that has this as a symptom. However, whether or not what you experience would rise to that level is something that would have to be determined by a mental health professional. You might garner some insight by reading through some of the various postings in the personality disorders forums.
http://forums.psychcentral.com/personality-place/
I see this is your first post here on PC. So... welcome to PsychCentral… from the Skeezyks!

I hope you find the time you spend here to be of benefit.
PsychCentral is a great place to get information as well as support for mental health issues. There are many knowledgeable & caring members here. The more you post, & reply to other members’ posts, the more a part of the community you will become. Plus there are social groups you can join & chat rooms where you’ll be able to connect with other PC members in real time (once your first 5 posts have been reviewed & approved.) Lots of great stuff! So please keep posting!