as life begins and ends

Why is it whenever we seem to be climbing out of a hole, things are getting back good, or even just normal, something, somehow comes along and sends you on an unparalleled new adventure that can seem nothing but bad at the time(I realize that things work out in time but still)? It seem that life is a constant reminder of what we cant have at times. I mean, honestly, I am trying my damndest to do my best and get out on my own and not be dependent on anyone to support me or anything, which is hard for me after everything that has happened to me in the last 6 months, but it seems on a daily basis, it gets harder while it gets easier as well.
I mean as you see on one hand, being home is easier in that i don't have a lot of the worries that I had when i was living on my own but i do have to answer to someone on EVERYTHING. i.e. where i've been, where i'me going, what i'm doing, who i'm with, excetera... that is something that i am not used to and dont especially like at all. I've dealt with it pretty well honestly, I mean as best as i can, and it seemed that things were looking up. today, for example, i had received a call from a job that i am really hopening to get and thins were really looking good. I went to get some clothes to wear for the interview for this and wouldn't you know it on the way home i totally wreck my dad's truck in a freak accident of his front wheel flying off...I mean if you can't see the irony in that then even know how to explain any of this too you.