What to do with disappointment?

I am a leader in my school, a member of my student council and recently i have been disappointing my peers and my teachers. I haven’t really been displaying positive leadership qualities and that i believe i posses. During this year, i have been very confused, and lost touch of who i am. Therefore i tried to find myself and who i am by acting as the bad guy, or the joker and it has gotten me in alot of trouble. For example i have not been completing my schools work, been joking around a bit too much and piking on younger kids ( as jokes, not bullying). What do you think i should do to get my self back on track. Do you believe i should become the once positive or leave it alone? Please and thank you for your time and help