It hurts, you mean, jealousy? (I don't care about spoilers anymore, this isn't the first post~)
Well, so many people here would love to have GB, me first, but I'm fine about it being pure fiction and accept the harshness of reality. I guess it can hurt to read this before you've reached that step of acceptance, though, and I admit it took me a while to do so.
Regardless, I enjoyed the story mainly because of how it speaks of the day-to-day joys and woes of being a girl, and through this, I was able to come to term with my wishes to be/look girly, how it's all right to feel that way and such.
And I know a ton of this is unrealistic, but seeing the main character, who was even forced into changing genders, adapt so well, in detail, day by day, even though that's not how it happens in real life, or even how it would happen if GB existed, that made me feel more at ease with transition and full time. I used to fear that point, that wall to cross, but now I'm just looking forward to it and cursing my low oestrogen levels and the delays needed for a name change.