To reiterate,
A#sus 2 is just a A# with an open d string which you hammer on the 2nd fret(* is the hammer on sign).
A#sus 4 is the same as a A# except the d string is played on the 3rd fret.
A#maj9 comes up later and it's like a A# except the middle note is on the a string not d
This is how Mitch plays it himself.
A#sus2 * A#sus4 x3 A#
A#sus2
i'll start it off by saying i'm not one for the complaining
A#sus4
you wouldn't know it from my writing
A#
you wouldn't know it from my songs
A#sus4 A#sus2 *
but i am different, i am free
A#sus4 A#sus4
i am what you need
A#sus2
A# A#sus2
but oh my god, i miss you more than i thought was possible
A#sus4 A#maj9
i understood the obstacles but you could have tried more
A# A#sus2
because sometimes it seems, i need a mom more than i need to eat
A#sus4 A#
so i didn't eat and i didn't sleep, i'd go all day without a bite
A#sus2 *
and that's not my fault
A#sus4
that's not my fault
A#maj9
A# A#sus2
and i'll admit sometimes my chest gets so tight that i throw fits
A#sus4
you said you'd always be there, where are you through all of this?
A# A#sus2
because this is hard, this is way harder than i thought
A#sus4
i'm so concerned about the ending that i don't even know the plot
A# A#sus2 A#
except for i am different, i am free
A#sus4
i am what you need
A# A#sus2 A#
i am different, i am free
A#sus4
i am what you need
A# A#sus2
so you think of all the things that make you sad
A#sus4
and don't include them in your better half
A# A#sus2 A#sus4
because i'm not like you
A# A#sus2 A#sus4
i don't find happiness in a meaningless existence
A#
i don't know what i'm going to do
A#sus2 A#
but i am different, i am free
A#sus4
i am what you need
A# A#sus2
and yeah, i believe that there's a god
A#sus4
i believe that there is something out there other than my thoughts
A#
i believe it was never science against religion
A#sus2
it wasn't poor against wealth
A#sus4
It was always me against myself
A#
and i'm so scared who's going to win
A#maj9
because i wake up feeling so shitty
A#
it's been so long since you've been with me
A#sus2
i don't know where this old body's going to go
or my soul
A# A#sus4
but i know i am different, i am free
A#sus2 A#
i am what you need
A# A#sus4
i am different, i am free
A#sus2 A#sus4
i am what you need