It isn't just you.
Spot forex has no centralized exchange, and therefore there's no way of monitoring or recording volume.
The only information that a spot forex "broker" can convey on this subject is their own volume, which is basically useless garbage, as you've rightly commented.
There's nothing to stop one from using the volume of the front month's equivalent forex future as a substitute, though (and it can be a very good substitute: I've tried it, myself, in the past), but this then begs the obvious question "Why not simply trade the futures, instead?" for all their other advantages in addition to the availability of volume.