Why do I find it hard to write the next line

 [Verse 1]
So true funny how it seems
Always in time, but never in line for dreams
Head over heels when toe to toe
This is the sound of my soul
This is the sound
I bought a ticket to the world
But now I've come back again
Why do I find it hard to write the next line
Oh I want the truth to be said

 [Chorus] Huh huh huh hu-uh huh
I know this much is true
Huh huh huh hu-uh huh
I know this much is true

 [Verse 2]
With a thrill in my head and a pill on my tongue
Dissolve the nerves that have just begun
Listening to Marvin (all night long)
This is the sound of my soul
This is the sound
Always slipping from my hands
Sand's a time of its own
Take your seaside arms and write the next line
Oh I want the truth to be known

[Bridge] I bought a ticket to the world
But now I've come back again
Why do I find it hard to write the next line 
Oh I want the truth to be said

Comment:  Why is the phrase "Why do I find it hard to write the next line" in there?  It sounds like the song writer couldn't find anything that fit. But the "official" explanation is "True is about how difficult it is to be honest when you're trying to write a love song to someone."
https://www.theguardian.com/culture/2012/may/14/how-we-made-true-spandau-ballet

And supposedly, this has a reference to Lolita by Vladimir Nabokov with "Take your seaside arms".

Now what does "I bought a ticket to the world" mean?