Someone's else shots in my Lightroom!

C'mon guys, I know what i am saying, someone got my account.

I spoke with an adobe assistant yesterday and, actually, we could see that someone's macbook pro showed among my activated machines. That's it. I've been hacked. Be careful. 

Are you sure this is not the "Adobe Community" with examples for photos from other people for inspiration and learning?

This is a user/peer support forum, which Adobe Support does not monitor.  For account security concerns please contact Adobe Support directly.   Visit https://helpx.adobe.com/contact.html, sign in, and then select the chat option.

In the meantime, I recommend you immediately change your Adobe ID password that you use to sign into the Lightroom app.  Or if you use a social sign on method like Facebook, Google, or Apple, again you should change your password there, and then sign out and back into Lightroom.  On Facebook, you may also want to go the extra step of removing Lightroom in your Facebook settings (you can re-add the the next time you sign into Lightroom).  I have no don't know if someone else has access to your account, but changing your password is an important step in securing your account.

Is it possible you are viewing the Learn or Discover tabs?  These are photos from other people that do not really exist in your account.

Is it possible you have purchased and imported Presets?  Edit Presets are imported by importing images with edits applied, and of course these would come from someone else (not your camera).

Is it possible you have a shared album, which other people are invited with permissions to add photos?  This is the only normal and expected way for other users to add photos to your account.  I'm referring to this feature: https://helpx.adobe.com/lightroom-cc/using/save-share-photos.html 

Again, I urge you to contact Adobe Support directly to get their help, especially if my suggestions and questions above don't explain what you are seeing.