ITunes WON'T erase my music

I managed to take all my music from my old computer over to iTunes on my new computer, and now I would really like to start again with a new iTunes Library, and I didn't transfer all those rubbish songs I had been sent, etc from my last library, or had been deleted…

So, now my problem is that I WANT to Sync and Erase, but it won't…

It says I don't have the extra 5GB required for this library, which is Bull cause it says my library is only 12gb, and I have a 32gb iPhone, and it says I have plenty of room!

Can anyone help? I'm presuming it's because it's just trying to add to the current library on my iPhone?

Any advice?

Thanks guys.

Added (1). No, I know how to 'un-check' music. It's not syncing is what I'm trying to say.

I want the music, library (whatever) is on my iPhone to ERASE, in exchange for what's on my iTunes on my new laptop, but it won't come off! I've tried doing everything manually but it says there's not enough space, when there's plenty!

From itunes, on the left hand side near the top where it says library click music. Then right click the stuff you want to delete and click yes

I tune suck.use winamp it's free &light too 15mb i guess.

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