Is it normal for you emotions to get less and less intense with age?

I have always been a very emotional person, and have always wanted to be an artist in galleries. I had all sorts of anger and depression and felt beauty in everything. I was a pacifist because I couldn't stand the thought of anything being in pain. I even got upset when I found a dead ant in my sketchbook because I had killed it without even realizing it. I moved away from my hometown and all of a sudden I just didn't care about any of it. 20 years of wanting to be an artist and finding inspiration and beauty in everything I see. Getting pissed or sad at the drop of a hat. Then I moved here and there was nothing. I still feel things. I love my family and cry when something sad happens etc. I just can`t draw anymore because I just can`t feel it. I have no pion or anger, no intense motion. Is it normal to lose it, even when you live your entire life by it? What happened?