I daydream all the time too, imagining the perfect life for myself. I've done this since I was a little kid. I didn't know this was something other people did regularly. However, my day dreaming hasn't really been a hindrance for me.

The only thing I can say is that motivation doesn't matter; it's discipline that keeps you going forwards. Are you motivated to brush your teeth every day? To keep your house relatively clean? To take out the trash when it piles up? To clean the dishes? To go to work (or school) every morning? Probably not. You make yourself do those things because you know that if you didn't, you'd be fucked over in some way (your teeth would rot or you'd lose your job or whatever). You have to take that same discipline and apply it to your other goals in life. The easiest way to do that is to form a habit. Make working on self-improvement as regular a habit as brushing your teeth. It doesn't matter if you're tired or unmotivated. You just do it because you have to.