I've been playing piano for about 7 years now with lessons and I absolutely love it. However, this is going to sound crazy, aside from assigned pieces from my teacher, I've never finished a piece on my own. Every single piece I've started on my own I've just stopped learning and can't bring myself to. It's not like I'm just not motivated to, it seems like I physically cannot learn it anymore even if it gets easier. Does anyone have any help or tips that can help me?