This is an old but nice song for a happy christmas time. Hope you enjoy!
https://www.youtube.com/watch?v=-OBKkmXgXJU

[Intro:]
 A  D  A  D

[Verse 1]

A                   D              A
    'Tis the season    to be jolly
                         D
But how can I be when I have nobody
A                      D                       A
    The yuletide carol    doesn't make it better
                 D
Knowing that we won't be together


[Pre-Chorus]

F#m
    A silent night
C#m7
    I know it's gonna be
F#m                  
    Joy to the world
E                         (C#m7)
  But it's gonna be sad for me


[Chorus]

F#m                 D
What do the lonely do
   C#m7
At Christmas
         F#m                D
Oh, oh, what do the lonely do
    E        A
At Christmas time


[Verse 2]
 
                      D                     A
The children can play     with their new toys
                           D                   A
While their little hearts burst open with joy
                    D                         A
And lovers can kiss     beneath the mistletoes
                    D
The choirs can sing  those glorious songs of old


[Pre-Chorus]

F#m
  But what is left
C#m7
   Oh, for me to do
F#m                     
  Now that it's Christmas
E                   (C#m7)
  And I don't have you


[Chorus]

F#m                 D
What do the lonely do
   C#m7
At Christmas
         F#m                D
Oh, oh, what do the lonely do
    E        A
At Christmas time


[Instrumental]
 G  A  G  A 


[Chorus]

F#m                 D
What do the lonely do
   C#m7
At Christmas
         F#m                D
Oh, oh, what do the lonely do
         C#m7 
At Christmas 

F#m                 D
What do the lonely do
   C#m7
At Christmas
         F#m                D
Oh, oh, what do the lonely do
    E        A
At Christmas time

来源：www.ultimate-guitar.com