良いことだけ信じるようにしてるって英語でなんて言うの？

Another way to say "fortune telling" is "divination". When someone makes a prediction about what will happen in the future, it is called a "prophecy". There are lots of ways people may divine the future. They may read tea leaves, read tarot cards, read palms, or gaze into a crystal ball. It is normal to only want to hear prophecies that foretell good things. Nobody wants to hear they have bad times ahead.

I only believe the good information. I believe only when the fortune teller says good things. I do not believe any of the bad things that are told to me by the fortune teller.

When you have your fortune telling they tell you what they see happening in your future usually they can't tell you bad things but sometimes they might tell you little bits to warn you if you only want to believe the good news then both of these sentences are a good way to explain this

When you want to explain that you believe what a fortune teller has to say only when it is positive news, then you can say it in the following ways: -I only believe in fortune telling when it is good news -I believe in fortune telling only when it's good news -I only believe in good fortune when someone is telling me about the future.

If you are not really a believer in the skill of fortune telling, then obviously you may jokingly state that you will believe - but only the good parts! Clearly, if you did really believe, you would have to trust in every prediction, be it good or bad.

To explain that you only believe the good things that fortune tellers say, you can do so in the following ways: "I only believe in fortune telling when it's good news." "I only believe in positive fortunes."