Assalamualaikum 

Band	: Forever the Sickest Kids
Song	: My Worst Nightmare
Album	: Underdog Alma Mater
Tuning	: Standard

intro
  1st keyboard (piano)
e|--------------8--------------------|
B|-5-6-8--6--5-----8--5--6--5--------|
G|-----------------------------5-7---|  X2
D|-----------------------------------|
A|-----------------------------------|
E|-----------------------------------|
 |
 |2nd keyboard (comes in the 2nd time)
e|-------8-7-5--------7-5----------5-3---------------|
B|------------8-6-5-3----8-6-5-3-1----6-5-3-1-0-1----|

verse 1a "I shouldve known better "
Guitar
Starts exactly at " around, why did i "
  X8    X8   X8   X8   X8   X8
e|--------------------------------------------|
B|--------------------------------------------|
G|-5-------------------5----------------------|
D|-5----3----7----5----5----3----7-7-7--7-5~--|
A|-3----3----7----5----3----3----7-7-7--7-5~--|
E|------1----5----3---------1----5-5-5--5-3~--|

verse 1b "never did " and "secretly "
There is no guitar here but if you're playing alone u can always play it this way, like 
always do 
e|-0~----0~----0~----0~----|
B|-1~----1~----1~----1~----|
G|-0~----0~----0~----0~----|
D|-3~----2~----2~----0~----|  X2
A|-3~----3~----0~----2~----|
E|-------------------3~----|

rap
This part has no guitar also..
e|-0~----0~----------0~----|
B|-1~----1~----3~----1~----|
G|-0~----0~----2~----0~----|
D|-3~----2~----0~----0~----|
A|-3~----3~----------2~----|
E|-------------------3~----|

e|-0~----0~----0~----0~----|
B|-1~----1~----1~----1~----|
G|-0~----0~----0~----0~----|
D|-3~----2~----2~----0~----|   ends with 
A|-3~----3~----0~----2~----|
E|-------------------3~----|

E|-1(staccatoed)--|

chorus a
e|--------------------------------------------|
B|--------------------------------------------|
G|--------------------------------------------|
D|-33333333--7777?-5555--33333377--55555555---|
A|-33333333--7777?-5555--33333377--55555555---|
E|-11111111--5555?-3333--11111155--33333333---|

e|--------------------------------------------|
B|--------------------------------------------|
G|--------------------------------------------|
D|-33333333--7777--55----x2-x3-7~--5~---------|
A|-33333333--7777--55----x2-x3-7~--5~---------|
E|-11111111--5555--33----x0-x1-5~--3~---------|

post-chorus
e|------------------------------------|
B|------------------------------------|
G|------------------------------------|
D|-3-3---55---77---2-2---7~-55---55---|  X2
A|-3-3---55---77---2-2---7~-55---55---|
E|-1-1---33---55---0-0---5~-33---33---|

verse 2a "if it's just me "
Same as Verse 1b

verse 2b "push thru "
Not really sure bout this but this sounds ok to me 
e|-----0------------------------------|
B|-----1-------1-------1-------1------|
G|-------0-----0-0-----0-0-----0-0----|
D|---3-------2------------------------|  X2
A|-3-------0---------2-------2--------|
E|-----------------3-------3----------|

pre-chorus
  X8    X5
e|-----------|
B|-----------|
G|-----------|
D|-3----5----|
A|-3----5----|
E|-1----3----|

chorus b
e|--------------------------------------------|
B|--------------------------------------------|
G|--------------------------------------------|
D|-33333333--7777?-5555--33333377--55555555---|
A|-33333333--7777?-5555--33333377--55555555---|
E|-11111111--5555?-3333--11111155--33333333---|

e|--------------------------------------------|
B|--------------------------------------------|
G|--------------------------------------------|
D|-33333333--7777--55----x2-x3--xx?-xx7-5~----|
A|-33333333--7777--55----x2-x3--xx?-xx7-5~----|
E|-11111111--5555--33----x0-x1--xx?-xx5-3~----|

Play chorus a

interlude
e|---------------------------|--------------------------|
B|---------------------------|--------------------------|
G|-----555-777-444--10-10-99-|-----777-555-777-10-10-99-|
D|-555-----------------------|-777----------------------|
A|---------------------------|--------------------------|
E|---------------------------|--------------------------|
   ... ... ... ...  .  .  ..   ... ... ... ... . . . ..

e|---------------------------|--------------------------|
B|---------------------------|--------------------------|
G|-----555-777-444--10-10-99-|-----555?-----------------|
D|-555-----------------------|-777------\--55555555----|
A|---------------------------|----------\--55555555----|
E|---------------------------|----------\--33333333----|
   ... ... ... ...  .  .  ..   ... ...(pickslide I guess)

  X8    X8   X16     X8    X8
e|--------------------------------------------|
B|--------------------------------------------|
G|-5------------------5-----------------------|
D|-5----5----3--------5----5-----22-3~---7~-5~|
A|-3----5----3--------3----5-----22-3~---7~-5~|
E|------3----1-------------3-----00-1~---5~-3~|

chorus
A lil' change at the beginning 
e|-----------------------------|
B|-----------------------------|
G|-----------------------------|
D|-3---------7~----55555555----|
A|-3---------7~----55555555----|
E|-1---------5~----33333333----|
 then proceed till the end (with chorus b and then chorus a)

outro
Same as the intro (piano) X4

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Assalamualaikum