This is pretty close to being correct, pehaps with a few minor corrections =)
Enjoy!

Capo 1st fret

All chords relative to capo

Chords used:


  Em Em/F# G  Am C/G B   G(2) Bm
E-0----X---3--0---0--2---X----0--|
B-0----X---3--1---1--4---X----3--|
G-0----X---0--2---0--4---X----4--|
D-2----0---0--2---2--4---X----4--|
A-2----0---2--0---3--2---5----2--|
E-0----2---3------3------3-------|

Intro:

Em Em

Verse 1:

Em (022000@1)       Em/F# (222000@1) G (320003@1)   Am (x02210@1) 
This was never the way I planned
   C/G (3x555x@1) BNot (x2444x@1)my intention
Em (022000@1)    Em/F#G          Am (x02210@1) 
I got so brave, drink in hand
     C/G (3x555x@1)  BLost (x2444x@1)my discretion
Em (022000@1)           Em/F# (222000@1)  G (320003@1)AmIt's (x02210@1)not what, I'm used to
    C/G (3x555x@1)  BJust (x2444x@1)wanna try you on
Em (022000@1)   Em/F#G   AmI'm (x02210@1)curious for you
       C/G (3x555x@1) BCaught (x2444x@1)my attention

Chorus:

Em (022000@1)  Em/F#G                 AmI (x02210@1)kissed a girl and I liked it
                 C/G (3x555x@1)  BThe (x2444x@1)taste of her cherry chapstick
Em (022000@1)  Em/F#G                 AmI (x02210@1)kissed a girl just to try it
          G(2)Em/F#      BI (x2444x@1)hope my boyfriend don't mind it
Em (022000@1)   Em/F#G
It felt so wrong
           AmIt (x02210@1)felt so right
              C/G (3x555x@1)    BDon't (x2444x@1)mean I'm in love tonight
Em (022000@1)  Em/F#G                 AmI (x02210@1)kissed a girl and I liked it
C/G  B
   I liked it

Verse 2 same as 1:

No, I don't even know your name
It doesn't matter,
You're my experimental game
Just human nature,
It's not what,
Good girls do
Not how they should behave
My head gets so confused
Hard to obey

Chorus:

I kissed a girl and I liked it
The taste of her cherry chap stick
I kissed a girl just to try it
I hope my boyfriend don't mind it
It felt so wrong
It felt so right
Don't mean I'm in love tonight
I kissed a girl and I liked it
I liked it,

Am (x02210@1)        BmUs (x24432@1)girls we are so magical
Em (022000@1)           BmSoft (x24432@1)skin, red lips, so kissable
Am (x02210@1)        BmHard (x24432@1)to resist so touchable
Em (022000@1)        Bm (x24432@1)   AmToo (x02210@1)good to deny it
AmAin't (x02210@1)no big deal, it's innocent

Chorus:

I kissed a girl and I liked it
The taste of her cherry chap stick
I kissed a girl just to try it
I hope my boyfriend don't mind it
It felt so wrong
It felt so right
Don't mean I'm in love tonight
I kissed a girl and I liked it
I liked it

Em (022000@1)