Violin part:
E|--12-10-9---------10-9----------------|
B|----------12-----------10-12----------|
G|--------------------------------------|
D|--------------------------------------|
A|--------------------------------------|
E|--------------------------------------|


It's pretty much those chords the entire time from what I can tell. Play a bit of the A 
major scale off the violin part and it sounds pretty cool :)


For the end: Play out using the same chords: A E Bm E



[CHORUS]
A               E
    If we were kids
           Bm             E                   A
I'd want to give you everything that you would want
           E
Those other boys
             Bm                 E
They gave you toys, but all they wanna do is
A
Keep up
                 E
Keep up, keep up, keep up
                  Bm
That's all I want, keep up
                E
Keep up with me, keep up
A
Keep up
                 E
Keep up, keep up, keep up
                  Bm
That's all I want, keep up
                E
Keep up with me, keep up


[Verse 1]
A
  I guess I'm fucking now

  I'm getting used to it
E
  It's cause I shine, and I ain't gotta use a crucifix
Bm
  Fuck the fussing and fighting and arguing to this and that
E
  And "Why you bein' mean to me Donald?" I never texted back
A
  I know it's comin' quick, wishin' I could fast forward
E
  Tell these nice girls they're the reason that I'm an asshole
Bm
  Omega to alpha male because of that dollar bill
E
  When I worked the mail room I ain't have a shot in hell
A
  I called her ass for two months and heard shit from her
E
  These girls couldn't care less when the chips under
Bm
  The chips are up and on my shoulder, you heard me?
E
  I take it out on girls who don't even deserve it
A
  The Girls I tried to hit last year, I still might
E
  Karmas a bitch who doesn't suck, but I still like
Bm
  If we were kids I had the black K-swiss and reebok
E
  If we were kids I wouldn’t act like this but we not


[CHORUS]
A               E
    If we were kids
           Bm             E                   A
I'd want to give you everything that you would want
           E
Those other boys
             Bm                 E
They gave you toys, but all they wanna do is
A
Keep up
                 E
Keep up, keep up, keep up
                  Bm
That's all I want, keep up
                E
Keep up with me, keep up
A
Keep up
                 E
Keep up, keep up, keep up
                  Bm
That's all I want, keep up
                E
Keep up with me, keep up


[Verse 2]
A
  You made a mistake. These dudes man you bathing in apes
E
  Finding you is like finding Asians I hate
Bm
  But they say I got a fetish, nah I’m skipping all of it
E
  Black or white girls come with a set of politics
A
  That’s all I was saying, I’m a proud man
E
  They wanna holla when they see your name on SoundScan
Bm
  Her name Mercedes but she push a brown Focus
E
  And she’s doing coke in front of me, but act like I don’t notice
A
  "There any breakage in that Trojan?"

  She see what she wanna see
E
  So I make her take plan B in front of me
Bm
  Women talk shit on men like all day
E
  But it's Pete Wentz, goes both ways
A
  They too busy stabbing hoes like OJ
E
  They too busy trapping pros like Kobe
Bm
  The only thing I put before me is do re
E
  If you had told me the truth we’d be ok


[CHORUS]
A               E
    If we were kids
           Bm             E                   A
I'd want to give you everything that you would want
           E
Those other boys
             Bm                 E
They gave you toys, but all they wanna do is
A
Keep up
                 E
Keep up, keep up, keep up
                  Bm
That's all I want, keep up
                E
Keep up with me, keep up
A
Keep up
                 E
Keep up, keep up, keep up
                  Bm
That's all I want, keep up
                E
Keep up with me, keep up