Ugh, piano.... I've been playing it since I was 6 (so it's 14 years now)... And I didn't play it for fun, I was, um, trained to play it. It was time absorbing, stressful and I will never touch Bach ever again. I switched to more basic stuff now, that I can add singing parts to. That's what makes me happy.
Let me just tell you that you can't master a piece like that immediately. It's not a bike, it's a real deal that people sacrifice their time and, very often, mental health for. You should try something easier at the beginning, even if you have absolute pitch, simply not to discourage yourself. Start with practicing every scale (is that what they're called in English?). That way you will understand how it all works. Then, try something by pop gurls, and gradually move to harder pieces.
When you're a beginner you have to first practice right hand part, then the left hand part, then both. And not a whole piece at a time, practice by parts - when you're sure you can play one part perfectly, add another one to that. Playing a track like this a vista will only bring frustration. Give yourself a time and practice, practice, practice, practice... and you will achieve a lot

Oh and do a warm up before every practice, play some scales.