Me and my girlfriend were having a lot of un protected sex. Im not going to lie I masterbated a during this time. I was showing std symptoms in men so I got checked out. They said their not for sure what I have, but considered it to be gnu. So my question is can I have gotten its from masturbation or other thngs besides sex and do you have to have intercouse to pass it on.

GNU is or appears to be a computer license, never hear of it as a STD.

Perhaps your spelling is off or you misunderstood.

And sorry, you go to the doctor, they know exactly the type and kind of STD you have
If some doctor said they don't know what type, run, he is not a real doctor