Why is everyone obsessed with changing their appearance?

well I'm barely 20 so I guess that in this time of my life I don't really stress over Plastic Surgery but I mean yeah I get what u mean, I haven't cut my hair in almost 3 years do to a promise I made and right now I feel like I've lost my Identity I guess sometimes the only way to stay happy is to feel different u know, I mean I feel like "unhappy" but the good thing is that in on Jun 1st I can finally go and get my self the makeover that I've been wanting ever since my son was born. I think the only way to feel good is to be different from everybody else, I don't know its your question is kinda complicated when u really get to thinking about it but Its a good question.