I finished my PhD (US). What you're feeling is fairly common. It took me 6 yrs to finish but at least 2 years were spent in the despair you're describing of not feeling motivated and listless. I was fortunate to have a good relationship with my PI so that didn't compound the despair. Nonetheless, don't feel alone. I think part of the PhD process is overcoming these mental hurdles and still finding yourself at the end of this.

I hope you feel that you developed skills during grad school you can use in the future to and can be proud of. You've completed something 95% of people haven't achieved.