Don't feel sad, remember the experience you had from playing on the JP version. It has given you a 6-12 months head start in the end. (Depending on how long you played it.)
By the time the NA version releases on PC, I have no doubt it will bring along new SHIPs as well. Those are going to be pretty much free from 'current' players anyway, sure a couple will transfer over but the population of these new SHIPs will for the majority exist of 'new' players. So don't worry too much about having to catch up.
Now what about "But my friends are all playing on one of the current SHIPs and I wanna join them." If one is to be considered a PSO2 veteran, then thou has no problem catching up with them in no time. If one is not a PSO2 veteran, then thee shalt do the following; Order thy friends to help thee catch up to them. If they don't want to, consider this part of the 'Safety Dance' song to be valid for thy situation:
We can dance if we want to, we can leave your friends behind.
Cause your friends don't dance and if they don't dance, well they're are no friends of mine. (Let's see who understands the underlying message.)
Within a year from now, pretty much everyone will have forgotten the head start the Xbox One users had. Or at least no one will mention/care about it by then. As a great philosopher once said: "Time will even out everything."
Time is relative, does the 2-3 months of a head start really matter in the long run? In the end only time will tell.
If the NA version only lasts for a short period, then it probably does matter. (but then again you could question yourself if it was worth playing at all if it was so short of time.) What if the NA version lasts for a long time, then it probably doesn't matter. (On the other end, some will question themselves if it wasn't a waste of time playing it for so long.) What does one consider a 'short' and 'long' time, perhaps a subjective matter?
Speaking of subjectivity, "only time will tell". Time might indeed give you an answer, but does it give you an absolute truth? Time, allows you to generate a cultivated conclusion or opinion on a topic. But will that be the absolute truth on the subject, did having a head start matter in this case?