Intro:
Fm ?" C# - G# - D# x2
Piano / Guitar.
e--------------|-----------|    |----------|
B--------------|-----------|    |----------|
G---------8-10-|-----------|    |----------|
D--------------|--8-10-8---| x2 |---6-8----|
A--8--11-------|---------6-|    |----------|
E--------------|-----------|    |----------|
The last tone on the low E, G#, is originally played on piano and it's a D#.
The electric guitar won't be able to make it sound right, but the piano will.
Lead guitar play this i every verse - palm muted!
     Fm               C#             G#             G#
e--------------|--------------|--------------|--------------|
B--------------|--------------|--------------|--------------|
G---5------5---|-----3--------|--------------|--------------|
D-3------3-----|------------6-|--------------|--------------|
A--------------|---4-----4----|----6------6--|----6---------|
E--------------|--------------|-4------4-----|-4------------|
Verse 1:
              Fm                          C#                    G#      D#
She sees them walking in a straight line, that's not really her style.
             Fm                      C#                    G#      D#
And they all got the same heartbeat, but hers is falling behind.
Fm                          C#              G#     D#
Nothing in this world could ever bring them down.
Fm                        C#                        G#     D#
Yeah, they're invincible, and she's just in the background.
And she says,
Chorus:
Fm                        C#
"I wish that I could be like the cool kids,
G#                              D#
'Cause all the cool kids, they seem to fit in.
Fm                      C#                          G#         D#
I wish that I could be like the cool kids, like the cool kids."
Interlude:
Fm - C# - G# - D# x2
Piano / Guitar.
e--------------|-----------|    |----------|
B--------------|-----------|    |----------|
G---------8-10-|-----------|    |----------|
D--------------|--8-10-8---| x2 |---6-8----| x2
A--8--11-------|---------6-|    |----------|
E--------------|-----------|    |----------|
Verse 2:
             Fm                        C#                     G#   D#
He sees them talking with a big smile, but they haven't got a clue.
        Fm                          C#                         G#      D#
Yeah, they're living the good life, can't see what he is going through.
Fm                         C#                                G#    D#
They're driving fast cars, but they don't know where they're going.
Fm               C#                   G#      D#
In the fast lane, living life without knowing.
https://www.coveralia.com/acordes/cool-kids--rac-mix--echosmith.php
And he says,
Chorus:
Fm                        C#
"I wish that I could be like the cool kids,
G#                              D#
'Cause all the cool kids, they seem to fit in.
Fm                      C#                          G#         D#
I wish that I could be like the cool kids, like the cool kids."
Fm                        C#
"I wish that I could be like the cool kids,
G#                              D#
'Cause all the cool kids, they seem to fit in.
Fm                      C#                          G#         D#
I wish that I could be like the cool kids, like the cool kids."
Interlude: 
Fm - C# - G# - D# x4
Piano / Guitar.
e--------------|-----------|    |----------|
B--------------|-----------|    |----------|
G---------8-10-|-----------|    |----------|
D--------------|--8-10-8---| x2 |---6-8----| x4
A--8--11-------|---------6-|    |----------|
E--------------|-----------|    |----------|
And they said,
(Silent part - play if you want to!)
Fm                        C#
"I wish that I could be like the cool kids,
G#                              D#
'Cause all the cool kids, they seem to fit in.
Fm                      C#                          G#         D#
I wish that I could be like the cool kids, like the cool kids."
Fm                        C#
"I wish that I could be like the cool kids,
G#                              D#
'Cause all the cool kids, they seem to fit in.
Fm                      C#                          G#         D#
I wish that I could be like the cool kids, like the cool kids."
Fm                        C#
"I wish that I could be like the cool kids,
G#                              D#
'Cause all the cool kids, they seem to fit in.
Fm                      C#                          G#         D#
I wish that I could be like the cool kids, like the cool kids."
Interlude 'till fade-out:
Fm - C# - G# - D#
Piano / Guitar.
e--------------|-----------|    |----------|
B--------------|-----------|    |----------|
G---------8-10-|-----------|    |----------|
D--------------|--8-10-8---| x2 |---6-8----| x4
A--8--11-------|---------6-|    |----------|
E--------------|-----------|    |----------|