I have a Psychologist, and I told him about my fetishness, his reply was, "Thank God you're human". So in your queation it is absolutely ok to discuss this and if they judge ir find it weird, then find another Psychologist.
There are ethics rules in this. These rules are, It is client lead, client must trust the Psychologist and build that rapport. If Psychologist judges the client then the client can feel hurt and the therapy won't work. Amongst other acts as well but these are the main ones
Now with Psyciatrist, that's a different matter, I would be very fearful of them and they could cause harm than good.
There is a difference between Psychologist and Psychiatrist.
Psychiatrist are medically trained, they can have a final say, they can put clients on meds, they can enforce power over a patient. They are a doctor.
Psychologist are not medically trained and cannot give meds.
They have ethical acts to follow and if these acts are not followed then these are fake Psychologists. Every country has their own procedures so please bear that in mind.
This is from UK ethics. In another country the ethics are different. Not all fits all.
It is OK to talk about fetishes, it is ok to be honest with a Psychologist. These are there to help, to know you, to understand you, it is the only way a client can understand themselves too.
What if a client had sex therapy, that's a Psychologist, what if the fetishes got too much? Or what if the client doesn't understand about the fetishes? Could suffer in silence for a very long time. With a genuine therapist it can help a great deal.