First of all, read
this thread. All of it, and read all the threads it links to as well. You'll find all the answers you need, and quite a few to which you haven't thought of the questions yet.
A and C asks why pilots often 'slag off there [sic] jobs' here. The main reason that there are posts showing the downsides of the job is that many wannabes hold a totally rose-tinted impression of the job of an airline pilot, and they need to get a reality check before they commit to spending up to 100 grand on the training. It is not all sweetness and light, and you wannabes need to understand that.
That said, I still love my job after 28 years of professional flying!
Scroggs