Like others are saying, they're not perfect. They're normal girls that have just been touched up with loads of makeup and had their hair nicely done and have been edited to hide other flaws. I'm not going to tell you not to try to be a tumblr girl, because, I myself have wished many times that I looked like them; but, don't beat yourself up about it, your beautiful the way you are.
i am going to be honest with you. be yourself. those girls on tumblr are no better than you. you are beautiful in your own way. you don't need to be a tumblr girl. just be yourself and be confident in who you are. believe me, those girls all wear tons of makeup and spent hours on their hair! be yourself and always remember that you are beautiful! these girls have been photoshopped to be what society has said is beautiful! your perfect in your own way. don't give in to what society says is the perfect girl or guy