I'm in a similar situation, but slightly worse because I'm in debt. I'm doing a degree in Film and Television Studies and it has been pretty awful. To be honest, I can't really give you many answers, because I feel exactly the same. Sometimes I feel completely hopeless, but sometimes I think I'll be OK. When I graduate, my plan is to move to London and start as a runner. A lot of people start like that. Just look at Charlie Brooker, guy didn't even graduate and started by writing in a video-game magazine. So it's definitely possible.
When it comes to convincing your parents, just tell them that you'd rather say that you tried, than die having not even attempted to reach your dream. At the end of the day, it's your life. Your mistakes. They don't have a final say.
Your experience seems good so far! (better than mine, I was a runner for Disney a couple of times, but that's about it).
Some of your questions:
2) Yes. I think you should. What else are you going to do? Unless you are really passionate about something else, then you have no other choice. You need to do something that you'll be happy doing.
3) Send emails and make calls to companies. Facebook has a lot of groups for runners, where jobs are posted. Also, MOVE TO LONDON.
4) Same as 3) really.
5) Not really. I know some people who graduated from the film course at Bournemouth uni, one of the best unis for film in the country. And they were doing the same **** as I was, they were runners starting from the bottom. There's no magic course that will teach you anything that is essential for you to work in this industry. You learn most of it on the field.
6) A lot of freelancing. A lot of waiting for opportunities. Getting lucky. It's not easy. I feel sad often about it...but again, what else are you gonna do? I have nothing else I'm passionate about, so I have to do this.
7) What are your other interests?
8) Yeah, don't go into this for the money.
9) Unis selling you Mickey mouse courses.