Correction:  Student's sentence   Corrected sentence        Grammar explanation       Better sentence            

I still don't think  I'm a leader.

This sentence is correct.

Because usually people with leadership are considerate of others and lead well, but I am not like that either. 

Usually, people with leadership are considerate of others and lead well, but I am not like that either. 

Be careful with spelling some words and sentences that do not usually start with because. 

I felt that I needed to develop leadership because the instructors told me every mentoring session in the department that kindergarten and daycare teachers need leadership. 

I felt that I needed to develop leadership because the instructors tell me every mentoring session in the department that kindergarten and daycare teachers need leadership. 

You can use the base form of the verb if the action is habitual or is always happening. You can only use "told " if it's finished and does not happen again.