My first tab so sorry if i got anything wrong :) 
tuning: standard 
chords: G, D, Em, C, Dm and A 
Capo: i put it on the first fret because it suits my voice better but it works on all the frets :)

G (320003@1)   
what if i cant make it,
Dwhat (xx0232@1)if its not meant to be,
Emwhat (022000@1)if all the plans I've made,
C (x32010@1)come crashin' down on me,
G (320003@1)       Dwhat (xx0232@1)if i believe you,
Em (022000@1)     C (x32010@1)when you said that you were mine,
G (320003@1)     D (xx0232@1)       Em (022000@1)              Cwhat (x32010@1)if we're all running out of time.

G (320003@1)       D (xx0232@1)              C (x32010@1)what if i could write the story,
Em (022000@1)                     Cwhat (x32010@1)if all this ends in glory,
 C (x32010@1)        Emwhat (022000@1)if the moon and stars,
        Dm (xx0231@1)          
and the world is ours,
G (320003@1)            Em (022000@1)      
if only dreams could live,
A (x02220@1)                  C (x32010@1)
and id never have to say,
G (320003@1)what if.

Gwhat (320003@1)if i could go back,
Dto (xx0232@1)the way it used to be,
Emwhat (022000@1)if there's a moment,
Cor (x32010@1)a second chance for me,
G (320003@1)             Dwhat (xx0232@1)if i don't wanna see you,
Em (022000@1)                    C (x32010@1) 
when we're standing face to face,
G (320003@1)     D (xx0232@1)   Em (022000@1)          Cwhat (x32010@1)if i was always second place.

G (320003@1)       D (xx0232@1)             Cwhat (x32010@1)if i could write the story,
 Em (022000@1)                    Cwhat (x32010@1)if all this ends in glory,
C (x32010@1)         Em (022000@1)what if the moon and stars, 
        Dmand (xx0231@1)the world is ours,
G (320003@1)                  Emif (022000@1)only dreams could live,
A (x02220@1)                  Cand (x32010@1)id never have to say, 
Gwhat (320003@1)if.