How do you change yourself?

i wanna change a lot about myself. im an angry, negative, unmotivated person and i want to become more positive and possibly happy. dont take it the wrong way that i wanna change myself. i just wanna be happy, and if im not happy with myself how is anything else supposed to make me happy? i can change myself, but the changes are always short-lived. how do you make a lasting change in your life? i think its pretty obvious that im young, 16, so i just wanted to throw that out there.How do you change yourself?
do different stuffHow do you change yourself?
TRY to be positive in all you do this book will help ,THE POWER OF POSITIVE THINKING by n,v,PEALE.
when you do something wrong, or something that you want to change about yourself, it has to bring a lot of pain and hurt so that you want to change yourself and keep that change, so you dont feel that pain again. next time you do something bad, think about it so deeply that you get upset, but create a change in that same mindset.