The way I boosted my confidence is that I found a skill/talent I had that no one else possessed. From there I walked around looking at other people and was like "I got you beat on this" from there I started to notice how unique I was and how noone has anything on me. Arrogance kind of did help too, but I grew out of that. But now I know that I have worth and value that someone else is envious of. And when they make it clear they are hating, my ego is boosted even more.