Assuming the centre of attention – why you find some people so annoying

Yes… Some people just seem to be more annoying than others, and the reason is usually attention. You (me too) become annoying when – in a conversation – you assume the centre of attention.
Say someone’s talking about school, and you jump from what they were saying to talking about your school and how you did really well in your classes/sport/whatever.
It has nothing to do with what had been said. It has nothing to do with the other people listening.
What’s happened is that you’ve grabbed other people’s attention, without their permission, and you’ve assume the centre of their attention. You’ve demanded they give their attention to you and your topics of conversation.
You’ve taken the talky-stick and people are wishing they didn’t have to listen to you.