Is it normal not to enjoy G-spot stimulation?

Completely. Plenty of people find G-spot play underwhelming or uncomfortable, and many orgasm mainly or only from external clitoral stimulation. Your body isn't doing anything wrong. If you're curious, try again when you're more aroused, with more lube or with a different toy shape. If it's just not for you, that's a valid answer, not a problem to fix.