That you spend more time, energy, money etc. than you feel that you should?
 It is partly that I spend so much time and then still feel like I fall short as a "good" teacher if that makes sense. I tend to plan and plan and plan and think things through and then sometimes my ideas don't even work anyway so that is annoying.
That the kids don't appreciate your efforts?
Not so much that they don't appreciate it but that my ideas don't inspire them or "work" a lot of the time. I don't really care that they don't appreciate my efforts (teaching is a bit like that anyway!) but more that the effort I put in doesn't seem to pay off with kids who respond in a positive way.

That the level of effort and energy you put in leaves you depleted in some way?
Yep for sure. I am finding it tough because I have to teach myself stuff as well as the kids ITMS. Because I have no music background I kind of need to teach myself theory etc. before I teach them. It isn't something that is familiar to me and I don't mind that usually but I am feeling exhausted by it all and I only work 2 days a week!

That you find the remainder of your work is relatively uninspiring to you?
 It is inspiring but not - teaching is a funny beast these days. Lots of politics, meetings, general kaka that sometimes doesn't leave much time or mental space to just stop and TEACH.
Or is it something else?
 Mm probably but can't think of what right now That all sums most of it up!

I guess my issues are more with doubting myself as a teacher and mostly, as a PA teacher as opposed to a teacher in general but then I have only been in this gig for 1 year part time, whereas as I was in a classroom for 4 years full time and then 2 years part time so it is much more familiar.