I thought I always wanted to play the piano.
And I do. But I have recently realised that 'wanting to play the piano' is not a good way of putting it.
I would learn to play a piece of music, perhaps not very well, but that's irrelevant to the fact that I would usually feel a bit let down after learning that piece of music,
I was puzzled why I was disappointed. After all, I was playing the piano, which is what I wanted to do.
So I thought and thought and realised that what I really wanted was to be able to sing songs while accompanying myself on the piano. Just hacking out some chords in a reasonable manner while murdering the song with my voice.
A goal of 'wanting to play the piano' just isn't a specific enough goal to have.
Suddenly practice sessions are a lot more fun, because I can see that what I am practising will lead to skills that I really do want to do and I feel as if I am playing music.
The short version of this is - think really hard about what you want out of learning your instrument.
And then you will see what what you are practising is helping achieve that.