maybe in Germany people lose their virginity at other age, who knows
The latter would suggest that just under half of German unmarried female 18-year-olds would be virgins, presuming it's accurate.
Again, I'm not addressing Bella specifically; there's quite a bit of her content I haven't yet seen (I'm pretty confident she hasn't had a boyfriend before, but much less so beyond that). But I think it's safe to say that it isn't a rarity for an 18-year-old western woman to be a virgin (though it's increasingly uncommon as she gets older).