To reiterate,
Dsus 2 is just a D with an open d string which you hammer on the 2nd fret(* is the hammer on sign).
Dsus 4 is the same as a D except the d string is played on the 3rd fret.
Dmaj9 comes up later and it's like a D except the middle note is on the a string not d
This is how Mitch plays it himself.
Dsus2 * Dsus4 x3 D
Dsus2
i'll start it off by saying i'm not one for the complaining
Dsus4
you wouldn't know it from my writing
D
you wouldn't know it from my songs
Dsus4 Dsus2 *
but i am different, i am free
Dsus4 Dsus4
i am what you need
Dsus2
D Dsus2
but oh my god, i miss you more than i thought was possible
Dsus4 Dmaj9
i understood the obstacles but you could have tried more
D Dsus2
because sometimes it seems, i need a mom more than i need to eat
Dsus4 D
so i didn't eat and i didn't sleep, i'd go all day without a bite
Dsus2 *
and that's not my fault
Dsus4
that's not my fault
Dmaj9
D Dsus2
and i'll admit sometimes my chest gets so tight that i throw fits
Dsus4
you said you'd always be there, where are you through all of this?
D Dsus2
because this is hard, this is way harder than i thought
Dsus4
i'm so concerned about the ending that i don't even know the plot
D Dsus2 D
except for i am different, i am free
Dsus4
i am what you need
D Dsus2 D
i am different, i am free
Dsus4
i am what you need
D Dsus2
so you think of all the things that make you sad
Dsus4
and don't include them in your better half
D Dsus2 Dsus4
because i'm not like you
D Dsus2 Dsus4
i don't find happiness in a meaningless existence
D
i don't know what i'm going to do
Dsus2 D
but i am different, i am free
Dsus4
i am what you need
D Dsus2
and yeah, i believe that there's a god
Dsus4
i believe that there is something out there other than my thoughts
D
i believe it was never science against religion
Dsus2
it wasn't poor against wealth
Dsus4
It was always me against myself
D
and i'm so scared who's going to win
Dmaj9
because i wake up feeling so shitty
D
it's been so long since you've been with me
Dsus2
i don't know where this old body's going to go
or my soul
D Dsus4
but i know i am different, i am free
Dsus2 D
i am what you need
D Dsus4
i am different, i am free
Dsus2 Dsus4
i am what you need