Am I being childish?

I have a job that I like and I can afford to live my life the way I want to live it. If I compare myself to many other people, I'm in a really nice situation. Specially on these harsh times.
Most important, my job is challenging. Or at least, it used to be. Is not that is less challenging now, but we are going through many changes and I don't agree with some of them. I have told my manager but he thinks that things are going on the right direction. If I look at things in perspective, some of them are although some others are not. Should I just grow up and accept that life is not always as we want it? Am I being childish by thinking that I should find something else and do not accept the changes? I need to think about this.

pushing limits

I've been enjoying cross country skiing for the past three months. I'm progressing at a fast pace and to test how much I've learned I decided to join to an activity by the "Ski Føreningen" (Ski association) and try to go 57 kilometers in a single trip!
I'm impressed with myself, I was able to finish the 57 kilometers without major problems. My strategy was to go a little bit slower than normal and do very little stops. In fact, I can count only two stop that lasted for more than 5 minutes. The other two stops were about one minute, and they were basically to drink some water. The fact that my skis were glided was a key factor, I was able to glide quite a lot and that made the energy saving part very effective. Together with the slow pace that made me feel really well.
Nevertheless, I'm exhausted but terribly happy!