To reiterate,
Gsus 2 is just a G with an open d string which you hammer on the 2nd fret(* is the hammer on sign).
Gsus 4 is the same as a G except the d string is played on the 3rd fret.
Gmaj9 comes up later and it's like a G except the middle note is on the a string not d
This is how Mitch plays it himself.
Gsus2 * Gsus4 x3 G
Gsus2
i'll start it off by saying i'm not one for the complaining
Gsus4
you wouldn't know it from my writing
G
you wouldn't know it from my songs
Gsus4 Gsus2 *
but i am different, i am free
Gsus4 Gsus4
i am what you need
Gsus2
G Gsus2
but oh my god, i miss you more than i thought was possible
Gsus4 Gmaj9
i understood the obstacles but you could have tried more
G Gsus2
because sometimes it seems, i need a mom more than i need to eat
Gsus4 G
so i didn't eat and i didn't sleep, i'd go all day without a bite
Gsus2 *
and that's not my fault
Gsus4
that's not my fault
Gmaj9
G Gsus2
and i'll admit sometimes my chest gets so tight that i throw fits
Gsus4
you said you'd always be there, where are you through all of this?
G Gsus2
because this is hard, this is way harder than i thought
Gsus4
i'm so concerned about the ending that i don't even know the plot
G Gsus2 G
except for i am different, i am free
Gsus4
i am what you need
G Gsus2 G
i am different, i am free
Gsus4
i am what you need
G Gsus2
so you think of all the things that make you sad
Gsus4
and don't include them in your better half
G Gsus2 Gsus4
because i'm not like you
G Gsus2 Gsus4
i don't find happiness in a meaningless existence
G
i don't know what i'm going to do
Gsus2 G
but i am different, i am free
Gsus4
i am what you need
G Gsus2
and yeah, i believe that there's a god
Gsus4
i believe that there is something out there other than my thoughts
G
i believe it was never science against religion
Gsus2
it wasn't poor against wealth
Gsus4
It was always me against myself
G
and i'm so scared who's going to win
Gmaj9
because i wake up feeling so shitty
G
it's been so long since you've been with me
Gsus2
i don't know where this old body's going to go
or my soul
G Gsus4
but i know i am different, i am free
Gsus2 G
i am what you need
G Gsus4
i am different, i am free
Gsus2 Gsus4
i am what you need