Successful people tend to know themselves very well: both strengths and areas which need development. Teachers, especially younger teachers, tend not to.
You should really be able to write down, without too much thought:
- Your skills and talents (Juggling? Spanish? Needlework?)
- Your strengths and competencies (Clear speaking voice? Getting up early?)
- Your inner strengths (Courage? Honesty?)
(Don't worry too much on the differences and definitions here: you get the point, I'm sure). The list of abilities that you have should be impressive; if you aren't able to do this without too much thought, then may be you need a little more thought. These represent your own personal armoury - the weapons that you can rely on in life's battles - and those that you cannot yet rely on confidently.