HOW TO DEAL WITH SEXUAL FRUSTRATION?

25F .It has been over a year that i have been intimate with a man and it's killing me. It is at a point that even masturbation doesn't even work.I can't focus on my studies anymore as all i think about is intimacy all the time.I am not in a position to get into a relationship right now ( previous relationships have taught me that having a boyfriend doesn't guarantee a satisfactory sex life) and i donot want to hook up or have casual relationships. So is there anyone going through a similar situation and how to deal with this?