I used the easiest chords EVER. I hope it's correct :)

Verse 1:

G (320003@1)                D (xx0232@1)  I know I've been holding it in
 Am (x02210@1)        C (x32010@1)  The way I feel about u
 G (320003@1)                   D (xx0232@1)  Something I've been dying to say
 Am (x02210@1)               C (x32010@1)  But I don't know how you'll take it
   Am (x02210@1)             C (x32010@1)  Oh Please don't go
   Em (022000@1)        D (xx0232@1)  You should know

PreChorus:

G (320003@1)   D (xx0232@1)   Am (x02210@1)  These three words

I've been holding back
   Am (x02210@1)   C (x32010@1)D (xx0232@1)  Trying to fight

Imma let em out
   G (320003@1)   D (xx0232@1)   Am (x02210@1)  These three words

gotta let you know
   Am (x02210@1) C (x32010@1)name="chord_xx0232@1">D
   Here I go go go

Chorus:
               G (320003@1)   D (xx0232@1)name="chord_x02210@1">Am
   Go screw yourse-e-e-e-elf
                  C (x32010@1)  I've had enough yeah
              D (xx0232@1)  now we're done
              G (320003@1)    D (xx0232@1)name="chord_x02210@1">Am
   Go screw yourse-e-e-e-elf
              C (x32010@1)  Not gonna lie yeah
           D (xx0232@1)  It was fun

But go screw yourself

Verse 2:

G (320003@1)                  D (xx0232@1)  Feels good just to get it all out
 Am (x02210@1)          C (x32010@1)  it's so not overrated
 G (320003@1)           D (xx0232@1)  U can't keep puttin me down
 Am (x02210@1)             C (x32010@1)  And getting away with it
   Am (x02210@1)     C (x32010@1)  Oh now I know
 Em (022000@1)         D (xx0232@1)  The way to say

PreChorus:

G (320003@1)   D (xx0232@1)   Am (x02210@1)  These three words

I've been holding back
   Am (x02210@1)   C (x32010@1)D (xx0232@1)  Trying to fight

Imma let em out
   G (320003@1)   D (xx0232@1)   Am (x02210@1)  These three words

gotta let you know
   Am (x02210@1) C (x32010@1)name="chord_xx0232@1">D
   Here I go go go

Chorus:
               G (320003@1)   D (xx0232@1)name="chord_x02210@1">Am
   Go screw yourse-e-e-e-elf
                  C (x32010@1)  I've had enough yeah
              D (xx0232@1)  now we're done
              G (320003@1)    D (xx0232@1)name="chord_x02210@1">Am
   Go screw yourse-e-e-e-elf
              C (x32010@1)  Not gonna lie yeah
           D (xx0232@1)  It was fun

But go screw yourself

Bridge:

Am (x02210@1)                C (x32010@1)  Guess I thought I knew you
            Em (022000@1)              D (xx0232@1)  Now I know I couldn't have been more wrong
 Am (x02210@1)                  C (x32010@1)  I had a feeling it would go this way
         Em (022000@1)          D (xx0232@1)                 G (320003@1)  And I waited waited way too long to say
         D (xx0232@1)          Am (x02210@1)  to say these three words
         C (x32010@1)          G (320003@1)  To say these three words
         D (xx0232@1)          Am (x02210@1)  To say these three words
       C (x32010@1) C (x32010@1)     C (x32010@1) C (x32010@1)  To say, to say, say-say

Chorus:
               G (320003@1)   D (xx0232@1)name="chord_x02210@1">Am
   Go screw yourse-e-e-e-elf
                  C (x32010@1)  I've had enough yeah
              D (xx0232@1)  now we're done
              G (320003@1)    D (xx0232@1)name="chord_x02210@1">Am
   Go screw yourse-e-e-e-elf
              C (x32010@1)  Not gonna lie yeah
           D (xx0232@1)  It was fun
            G (320003@1)    D (xx0232@1)name="chord_x02210@1">Am
   Go screw yourse-e-e-e-elf
                  C (x32010@1)  I've had enough yeah
              D (xx0232@1)  now we're done
              G (320003@1)    D (xx0232@1)name="chord_x02210@1">Am
   Go screw yourse-e-e-e-elf
              C (x32010@1)  Not gonna lie yeah
           D (xx0232@1)  It was fun

But go screw yourself

You can end with G :)
Hope you like it, xx