Perhaps....

I just need to focus on things I  can control.

My classes are going along well, with an occasional bump in the road.

I still enjoy coming to school each morning, still enjoy working with students again.

I can't fix everything.  I lack the wisdom and, honestly, the time and energy.

I am no Gahndi, not an MLK or Simon Bolivar.
Don't even make a decent Spartcus. Not really. I am not savage enough.

Why not focus on things I can do?

Sounds like a good solution to me.