I'm in a spot similar to yours I feel. I would say it's true to an extent, but you can't go about blowing her off most of the time. If she initiates the talk don't ignore her, talk to her. Just space...
As opposed to stabbing him one time and pissing him off even more? It's as simple as fight or flight. The kid that was picked on chose to fight. It's not a good thing that someone was killed but it...
You've gotta be comfortable in your surroundings. Every time you have a negative thought stop yourself and think something positive. It takes some time and practice but you'll get it down.
1800 is a cheap half p. Why not just sell more 'milk' to make your money back dumb fuk. Next time don't get 'milk' fronted, this is a prime example of why I don't deal with fronting/being fronted.