Should I or Shouldn't I Shave-Off My Hair?

My reason for this question is that I've not been so good with taking care of my hair so I tried cutting it short and I feel that it wasn't the solution to my problem even though I wanted to shave it off like a mohawk Rihanna had which was the first plan. So now I still hope for a what I still plan for but I saw a recent pic of Rihanna where she has her red hair but with a hsort haved haircut.