Junior vs women’s bike
This doesn't appear to be a current model--I can't find specs on this exact bike. This seems to be a house brand for Halfords, and I'm a little suspicious of a house brand, but that's just me.

The general advice given around here is that if the bike fits and you like it, get it. It doesn't matter who it was originally intended for. That said, this sounds like this bike is small for you.

A junior's bike might have lower gearing (junior racers have restricted top gears), although if this bike wasn't intended for racing, then maybe not.