Honestly, I’m not abnormal! Answers

You might enjoy the quip (= amusing remark) that the definition of a ‘family’ is "a group of self-seeking individuals loosely held together by a television set."

1 She uses the phrase ‘ just because‘ showing she is defending a position she expects people to criticise, or not to understand. She also says she is ‘not weird‘ showing she expects people to consider her odd. She also mentions that people have accused her of ‘being out of touch‘, as if having a TV is essential if people are to have any grasp of the outside world.
2 She mentions dinner-party conversations which assume people might have a shared experience or topic (which she obviously does not share), and also that she cannot discuss the programme ‘Eastenders‘ in the same amount of detail as someone who actually follows the programme.
3 "That is fine by me."
4 The fact that the author feels her own reactions to ‘the moving image’ are heightened because it is not part of her everyday life suggests that over-exposure might have the reverse effect on viewers. The writer appears more sensitive to what she sees on screen than someone who watches TV or films on a more regular basis – she says she is sometimes ‘haunted’ by what she sees for what she suggests may be longer than average.
5 No, not entirely – she worries that she ought to know more than she does, and clearly wonders if having a television would mean that she did know more about what is going on in the world and about current, social and cultural affairs.
6 Nothing – she cannot think of anything that would make her give in and purchase one.
7 Yes – she says people are shocked by the fact that she doesn’t own a TV, and imply that she must be ‘out of touch‘. She also wonders if she is ‘missing out‘ on things many people take for granted. She mentions feeling guilty and worried sometimes that she should know more than she does, suggesting the TV would introduce her to more current issues than at present. In addition, the phrase ‘Mind you‘ at the end of the text indicates either that the author is being humorous at her own expense (= about herself) or maybe that her friend has had this impression or is teasing her. The friend’s suggestion is that getting a television would broaden the writer’s life. The comments she makes about possibly being narrow in her outlook are jocular, and not serious ones, however, and the fact that nothing would induce her to buy a TV confirms this.

8 This immediately lets us know that the author has a radio, and does not have the same attitude towards the radio as she has about the television.