Guitar: Yamaha Pacifica 112J

Amp: Yamaha THR10x

I recently bought the THR10x and when i plugged in my pacifica it gives a fairly loud buzz. The buzz disappears when I touch the metal components of the guitar (the bridge, strings, tuners, the mounting screws of the selector switch) and the amp chassis. The buzz is getting louder when I turn the gain up but when I put the amp on clean the buzz is greatly reduced.

I have also noticed that when I put the guitar down on my bed (guitar is far from my body) and touch the strings the buzz will not disappear.

Also when Im touching the metal parts the amp hums and I expect that this the 60 Hz hum because it is barely noticeable when I select the humbuckers.

I am staying in a place where the electrical outlets have no ground (2 prong outlet). There is also a power line transformer about a hundred meters from my room. Can this be the causes of the buzz?

Can you guys give me information about my problem? Cheers