Be Angry and sin not!

Ok this post has nothing to do with a book review but I was angry earlier. Even through I felt that I had a right to be angry I feel bad when I am. Even through I did nothing wrong, ( no cussing, no name calling, no throwing things) when I get angry I feel like I am sinning. Yes I know Jesus got angry but He was Holy all the time. And I was only angry for maybe 30 minutes. Does anyone have any suggestion to help me not feel like a failure when I do get angry and do not sin. Yes there are times when I get angry and do sin. I'm looking for help on knowing the difference between the two. Thanks for any help.