As said mate, think everyone feels like that at times, its the joys of cars (or woes). ive had to do quite a bit of work to the Capri whilst still keeping on top of any problems my other car has as well. I don't know hardly anything about cars, so have to rely on my dads old mates for help and good friends. It does get you down so i can sympathise, but it'll all be worth it in the end believe me.
Oh and as for the security, i'm sure i can lend you my Dobermann, she loves sitting in cars