I think most people have this "ideal" image of what they want to be. That is why so many younger people think they will be models or movie stars or whatever. I used to have a stupid dream at one point and it wasn't until age 21 that I realized it just wasn't going to happen. The real world eventually comes along and crushes dreams for all except the luckiest few.
It is true that any given TG will try to make themselves into their "ideal" as much as they can within real boundaries.
Then you find out it is a lot of work and acting. So you learn to do the best you can with what you have.
For me, I never really had an "ideal" woman I would like to be. What I have isn't much but unlike too many TG, I learned to accept it and make the best of it. If you cannot be happy with what you have then having more whatever is not going to cure the problem.
Basically, once "there" becomes "here", you will simply seek out another "there" to obsess about.