I'll sum up your points Halx, 1) realize youre unique and different just like everyone else, this means if you think youre worse than most people (ie low confidence) youre not, youre the same and if you think youre better (ie high confidence) youre not, youre the same.
2) Which leads to 2, always project high confidence because knowing 1 you are now better than everyone else
3) Do your own thing, trying to controll other people ultimately brings unhappiness
4) and finally, if what youre saying doesn't matter or apply to the rest of the group, STFU!