Well if I were fixated on a celebrity and couldn’t get it off my mind, I would start by asking myself why.
What is it about this person that appeals to you so much? What qualities? Is it because you wish you had them or wish you had a partner or what is it specifically that you are wanting? I would get to the root of it, and then I would set to finding a way to fulfill those desires.
Find another celebrity crush. :)
Go out, meet new people , enroll some classes. The most important thing is to find someone from real life to spend your time with. Do not be tricked by actors/actresses , usually their personality are so far from their roles.