Yey! My first tab! :D This song is really simple! there's only 3 chords! :D 
It sounds best with bar chords. The timings might be a little bit out, but it's not too bad. :3 
Happy Playing!

Intro: E

E----------------------|
B--0-0-0-0-0-0-0-0-0---|
G----------------------|
D---2-2-2-2-2-2-2-2-2--|
A----------------------|
E----------------------|

ELet (022100@1)me in your room
                        BI've (x2444x@1)seen the rest of you
        A (x02220@1)                    EBut (022100@1)I know there's something more in your room
                              BI'm (x2444x@1)right outside your door
               A (x02220@1)                B(once) (x2444x@1)Show me things you've never shown before

AA (x02220@1)few pictures from your past
         BAnd (x2444x@1)the walls you painted black
         E (022100@1)                 B (x2444x@1)             AAnd (x02220@1)the secrets that you keep under your bed
            B (x2444x@1)        (hold)          EAll (022100@1)you have to do is let me in your room

BYou (x2444x@1)can be yourself
          A (x02220@1)                            EYou (022100@1)don't have to hide from me I won't tell
        B (x2444x@1)                                   AI (x02220@1)know everyone you've ever trusted has let you down
                             BAnd (x2444x@1)you don't want to come out
                                      (stop)
And show me, show me

AA (x02220@1)few pictures from your past
        BAnd (x2444x@1)the walls you painted black
        E (022100@1)                 B (x2444x@1)              AAnd (x02220@1)the secrets that you keep under your bed
                B (x2444x@1)                 EAll (022100@1)you have to do is let me in your room

AYou (x02220@1)know every part of me
  BI (x2444x@1)let you in, I let you see
        E (022100@1)             B (x2444x@1)           AAll (x02220@1)the dark in every corner of my room
                   BLet (x2444x@1)me do that for you
            AAnd (x02220@1)tell me all about your past
        BWhy (x2444x@1)you painted those walls black

E (022100@1)               B (x2444x@1)              ABaby (x02220@1)it's all right you're safe in here with me
                 BOpen (x2444x@1)up so I can see

AA (x02220@1)few pictures from your past
        BAnd (x2444x@1)the walls you painted black
        E (022100@1)               B (x2444x@1)             AAnd (x02220@1)the secrets that you keep under your bed
        AAn (x02220@1)open letter from your dad
         B (x2444x@1)A poster of your favorite band
         E (022100@1)                B (x2444x@1)          AIt (x02220@1)don't matter I'll take every part of you
               B (x2444x@1)             EAll (022100@1)you have to do is let me in your room
                       ELet (022100@1)me in your room

End on E