I can't resize my macintosh HD drive on os X 10.9.5 I have checked similar questions but didn't find an answer that worked.
I have a macbook pro late 2013 with OS X 10.9.5.

I have the OS X on the Macintosh HD drive (Mac OS Extended (Journaled)), windows on bootcamp and another 13 or so GB as "free space" (at the bottom)

On disk utility I don't even have the option to drag and change my Macintosh HD drive, and I can't seem to add the free 13GB to my main Macintosh HD doesn't matter what I do.

I did this in the past, and now just can't resize it at all - an image of my disk utility is attached. I just want to add the 13 GB of free space in the bottom to the main Macintosh HD drive. could you please help?

Thank you
What partition were you running from when you took that screenshot? If Macintosh HD is your boot partition, you may have to boot into the recovery partition in order to modify it.