There wasn't really a good tab for this yet so I decided to give it a try. 
I have no idea if this is right but it sounds good to me so it works. 
I'm not 100% on the chanting chords at the end of the chorus, just kinda took a guess at that. 
But anyways it's an awesome song so enjoy!

AI (x02220@1)had a plan and it made God laugh

It didn't work, should've checked the math
F#mI (244222@1)hit the wall 'cause I live too fast
DI (xx0232@1)didn't know it could hurt that bad
AI (x02220@1)clinged to hope when there was none
DI (xx0232@1)should've known that was so dumb

A(Whoa (x02220@1)oh oh oh)
D(Whoa (xx0232@1)oh oh oh)

AI (x02220@1)was a dick when I was seventeen,

I thought the world owed me everything
F#mBut (244222@1)who I am and who I'll never be
DIs (xx0232@1)all the shit that happens in between

A(Whoa (x02220@1)oh oh oh)
D(Whoa (xx0232@1)oh oh oh)

F#m (244222@1)            D (xx0232@1) 
There's no going back,
              A (x02220@1)                      EWhen (022100@1)life's a loaded gun, you pull the trigger, trigger
F#m (244222@1)            DThere's (xx0232@1)no going back
            AThe (x02220@1)past is in the past
             EThank (022100@1)God it doesn't last forever

AThere's (x02220@1)no going back
F#mFuck (244222@1)that going back
AThere's (x02220@1)no going back
F#mFuck (244222@1)that going back

Verse 3: (Same Chords)
Yesterday was another life
Turning left didn't turn out right
Stuck in hell when I was twenty-five
You can't regret what you don't decide
I should have stayed, should have let go
Should've, could've means you'll never know

(Whoa oh oh oh)
(Whoa oh oh oh)

Chorus: (Same Chords)
There's no going back
When life's a loaded gun, you pull the trigger, trigger
There's no going back
The past is in the past
Thank God it doesn't last forever
There's no going back
Fuck that going back
There's no going back
Fuck that going back

A (x02220@1)                   
The future I'm living now
D (xx0232@1)                           
Is not what I'd thought it'd be
F#mThe (244222@1)person I was before
DIs (xx0232@1)nothing like me
AThe (x02220@1)future I'm living now
DIs (xx0232@1)the way that I want it to be
F#mThe (244222@1)minute I walk through the door
DI (xx0232@1)slam it behind me

Chorus: (Same Chords)
There's no going back
When life's a loaded gun, you pull the trigger, trigger
There's no going back
The past is in the past
Thank God it doesn't last forever

There's no going back
Fuck that going back
There's no going back
Fuck that going back

Comments and corrections are encouraged. Thanks for learning!