Guitar 1 (intro riff/verse)
E|------------------------------------------------------|
B|------------------------------------------------------|
G|-5-55----------------5-55-----------------------------|
D|-5-55-3-33-77-5--555-5-55-3-33-77-5-555---------------|
A|-3-33-3-33-77-5--555-3-33-3-33-77-5-555---------------|
E|------1-11-55-3--333------1-11-55-3-333---------------|

Guitar 2 (only played between choruses, not during)
E|----------------------------------------------------------|
B|-8--8-8-13--13-13--8-8--13---8--8-8-13--13-13--8-8--13----|
G|-x--x-x-x---x--x---x-x--x----x--x-x-x---x--x---x-x--x-----|
D|-5--5-5-10--10-10--5-5--10---5--5-5-10--10-10--5-5--10----|
A|----------------------------------------------------------|
E|----------------------------------------------------------|

Verse Riff
E|------------------------------------|
B|------------------------------------|
G|--888888888888888888888888885-------|
D|------------------------------------|
A|------------------------------------|
E|------------------------------------|

Chorus
E|-------------------------------------------|
B|-------------------------------------------|
G|-5-55----------------5-55------------------|
D|-5-55-3-33-77-5--555-5-55-3-33-77-5-555----|
A|-3-33-3-33-77-5--555-3-33-3-33-77-5-555----|
E|------1-11-55-3--333------1-11-55-3-333----| 3x

Ending of Chorus
E|---------------------------------|
B|---------------------------------|
G|------------------5--------------|
D|--33333333555555555--------------|
A|--33333333555555553--------------|
E|--1111111133333333---------------|
"but i'm so young"

Bridge
E|--------------------------------------------|
B|--------------------------------------------|
G|-----5-----5-----5-----5-----5-----5--------|
D|--5-----5-----5-----5-----5-----5-----------|
A|--------------------------------------------|
E|--------------------------------------------|

Then just play the opening riff a bunch during the "nananana"'s
The chorus is played after that, 

Ending Chord
E|----------|
B|----------|
G|--4-------|
D|--5-------|
A|--2-------|
E|----------|
I'm 100% sure this chord is WRONG,
but i couldn't figure out the right chord to end with, so this will have to do.