Im not sure about your location (london) but here in america dissociation isnt about .....wanting to be someone else, or wanting to be with someone else..

here in short dissociation is a natural reaction to a trigger...

the easiest way to explain it is to think outside of the term dissociation for a moment and about a time when someone has said something that you did not like... their saying something you didnt like is called a trigger and the way the trigger made you feel is the reaction...

with dissociation something happens (trigger) that makes a person feel numb, spaced out and disconnected (reaction)...

example being stressed out (trigger) can make some people feel numb, foggy minded, disconnected (reaction) during the holidays.

here in america when someone purposely wants to be someone else thats called fantasizing, imagining, roll playing and fantasy play.

here in america when someone wants to be with someone thats called caring about them, being attracted to that person or wanting to be in a relationship with that person....

examples sometimes I want to be one of my best friends who does not have as many responsibilities that I have. Sometimes I pretend, act as if, imagine what it would be like to be that person. but then I look at the life I have and know in reality I would never change places with my friend.

this is different than dissociation and my having had alters because my alters were not my imaginary friends, my wanting to be someone else. before I was 5 yrs old I went through extreme trauma, the trauma and resulting memories, emotions that could not handle my brain separated these things from my conscious awareness and they became completely functioning alternate personalities taking control any time I encountered any thing of a triggering nature all through my life in every aspect of my life.

my suggestion is contact yours or a treatment provider in your own location , they will be able to explain to you what dissociation is in your location and what you need to do to help yourself to be comfortable with who you are rather than wishing you were someone else.