jealous of girlfriend all the time?

[T-Man]

im 17 and my girlfriend is all over social media and has thousands of friends and photos on fb and stuff and when she posts a picture she gets a ton of likes from guys and guys comment saying like oh your so beautiful nice smile blabla, and she goes on her gooogle + account and talks behind my back about not wanting to be with me but when we talk shes like blabla i was just mad. she also is an attention junky. she needs attention to function attention from everyone. she used to cheerlead but stopped because of a concussion but wants to do it again but is holding a little back because i hate it.. i hate how she wears little clothes and shows her legs and all these different positions in front of hundreds of people i hate it so much. i told her to just do it because i dont even want this relationship anymore im 17 i cant ake all this stupid non needed stress and jealousy. my last girlfriend was just a normal girl. not crazy popular, guys werent all over her, she played locrosse back in the day but didnt anymore like she was what i want in a girl.

the only thing that makes it hard to not be together anymore with my current girlfriend is that
1) i was her first and she was my first
2) were eachothers best friends
3) im completely alone without her

id appreciate some help ):

[Chris]

She is high maintenance. You show me a hot chick and I can find you a guy that got sick of her crap. Find a girl that isn't so into herself.

[henry]

Why are you jealous?

You're with her. Those other guys aren't xD

Let her cheerlead if she wants to

Don't you trust her?

You shouldn't give up something when you're best friends like that, it's a waste.

good luck!!