Am I being petty?

Yes very.

Yes

Sounds like you are leaning towards thinking of it that way. Perhaps you should think of it as flattery instead; obviously your friend thinks your extensions look great on you, and would love to emulate the look. Good friends are hard to find.

Imitation is the sincerest form of flattery. It just means that your friend thinks you look really pretty, & wants to look pretty too. Try to look at the positive side of things, it'll make you feel better.

Yes, yes you are.

Pretending some hair style is "yours" despite you borrowing it from someone else and buying it off the shelf is absurd.

If you were the friend how would you feel? This should provide some explanation.

You're on Yahoo Answers pretending to be a girl obsessing over another girl's hair. Oh, no. Nothing petty about that.

It makes me think that you suffer from deep personal insecurity.

yes

You gotta be not much older than 6 like previous answerer says