​Copyright is a sneaky creature.  It's likely that you own the copyright of your thesis, but not certain.  If you received a financial grant ​during the time you wrote it, then it might be "work for hire" and the grant body might own the copyright.  Or the university might own the copyright.  That's quite likely, in fact.  Technically, universities own the copyright of all work written by any of their employees, including professors.  Most universities ignore this fact; the more legally-aware one's have a copyright-waiver in their employment terms somewhere.   Most universities also require students to deposit a copy of their theses with the university, physically or as a PDF; that too may involve a transfer of rights.  So, it's possible that a university has the copyright to your thesis, in which case, they also have the right to give Google permission to copy it.  

I have written to ScribD in the past, asking them to take down dozens of my articles that had been reproduced there.  The process was a bit time-consuming, but ScribD did comply eventually and the illegal copies diasappeared.

I'm sure you can write to Google and ask them to take down your thesis.

Best,