OK, haha if you want to read through all this, THANKS A MILLION 
I have a very close friend who tries to act like me in a TON of ways.
Examples:
Any word/phrase I say frequently, she’ll say (I say, “yes ma’am, a lot and she does 2). This happens like every time I’m trying to be creative and then she starts saying stuff like that and acts like she and I made it up together. It’s not that big of a deal, but gets annoying sometimes when people say “that’s _____’s word!”
Example #2: Every friend I make is automatically her friend in her opinion. When we got combined with the other schools I met some really cool people and started talking to them. Of course, she did 2 and acts like they were her friend’s first and she’s known them longer. She doesn’t only do this in real life, but online 2!! 83% of her facebook friends are mine 2!!
Example #3: Everything I do with someone else she has to criticize! If I am having a good time with a guy I like she’ll have to say something to bring him down like “No offense, but he’s really ugly!” And it’s like, DID I ASK FOR YOUR FREAKING OPINION?
THERE ARE A MILLION MORE!
But I just want to thank people that read all this and please give me some advice on what to do with her!
tell her what u think without being to hard it sounds to me that she just doesnt know how to fit in
Ask her why she does the things she does…
If you like the answer…not if it sounds good, but if you like it
then continue on with the friendship and play off her “flaws”
If you don’t like the answer…maybe time for a new friend to spend more time with.
Well, this is a tough situation, I would say talk to her but she would probably get defensive really quick and try to accuse you of doing what she’s doing. I’m sure that’s really annoying though. Does she have any other close friends besides your friends? You may be one of her only real friends, and she may be acting like that to fit in.
With the saying the same words thing, sometimes when you hang out with someone long enough, you start acting like them. There was a time I was hanging out with a girl from another country at a summer camp and we actually picked up each other’s accents! But it doesn’t sound like that.
Next time she says something about a guy and you didn’t ask for her opinion, just nicely tell her, “I really like this guy, and I’d appreciate it if you would just be happy for me.”
I’m not really sure about what to do with the friends…maybe she’s just shy? But she shouldn’t automatically assume that they’re her friends too. She really just sounds like she’s clinging to you.
Action without a vision is a pastime. But vision without an action is only a day dream.
I hate when people do that. Gah, you have no idea.
Anyway, once I told a friend of mine that I got my hair cut rally short (a flat top). Sure enough, he rushed right out and did the same thing. Little did he know I was lying, and I tricked him. Since we both had fairly long hair, it took him months to grow it back out.
You could easily send him a Photoshopped photo of you with a different color hair, a hair cut, or something silly like that. If she does it, she might just learn her lesson.