I've been trying to find a tab for this song everywhere but haven't found the right one.
Instead I decided to mess around on my guitar a bit and try to find the right chords by ear.
Here is what I came up with. (Note that this may or may not be 100% correct.)
Feel free to leave comments/suggestions below.
[Updated - 5/9/11: Minor Fixes]
[Updated - 5/14/11: New Ending]
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Strumming:
It is easier to pick up the strumming pattern by listening to the song while playing.


Chords:

    G*    C   Dsus4  Em*
e|--3--|--3--|--3--|--3--|
B|-----|--1--|--3--|-----|
G|-----|-----|--2--|-----|
D|-----|--2--|-----|--2--|
A|--2--|--3--|-----|--2--|
E|--3--|-----|-----|-----|
*When playing these chords do not place a finger on the second fret of the B string


Intro:

G  Dsus4  C  G  Em  C

G                 Dsus4
It seems the more we talk
C                G
The less I have to say
Em                            C
Let's put our differences aside

G                Dsus4
I wanted to make you proud
C                 G
But I just got in your way
Em                               C
I've found a place that I can hide


 Dsus4
Now everything is changing
 Em
But I still feel the same
 Dsus4
We're running out of time


                   G Dsus4 C
What do I have to do?
G                    G Dsus4 C
To try to make you see?
G                  Em
That this is who I am
                          C
And it's all that I can be?


G                Dsus4
I tried to find myself
C                    G
Looking inside your eyes
Em                           C
You're all that I wanted to be

G                    Dsus4
There must be something else
C                G
Behind all the lies
Em                          C
That you wanted me to believe


 Dsus4
Now everyone is saying
 Em
That I should find a way
 Dsus4
To leave it all behind


                   G Dsus4 C
What do I have to do?
G                    G Dsus4 C
To try to make you see?
G                   Em
That this is who I am
                          C
And it's all that I can be?

                   G Dsus4 C
What do I have to do?
G                    G Dsus4 C
To try to make you see?
G                  Em
Trying to be like you
                       C G Dsus4
Isn't good enough for me.


                C G Dsus4
I won't let you go
                 C G Dsus4
I won't let you down
                 C G Dsus4
I won't give you up
                         C G Dsus4
Don't you give up on me now


                   G Dsus4 C
What do I have to do?
G                   G Dsus4 C
To try to make you see?
G                  Em
That this is who I am
                          C
And it's all that I can be?

                   G Dsus4 C
What do I have to do?
G                    G Dsus4 C
To try to make you see?
G                  Em
Trying to be like you
                       G Dsus4 C G
Isn't good enough for me.


[For the rest of the song after the lyrics have finished, you play 
the chords G, Dsus4, C, and G just like in the chorus over and over 
agian. Then when you want to end the song you play G, Dsus4, C, G, 
and one last strum of the G chord.]