Frustration

Am I the only one who gets very frustrated? I often feel like I am alone when I do this.

*ahem* How do you deal with your frustrations?
I am a beginner and have just recently begun with portraits. I just completed a commissioned portrait which was intended to be a practice run for me. This is of an acquaintance of whose face I found appealing.

Anyway, during the mid-way point I did feel the need to just toss my paintbrushes away and tear up my paper.