Having trouble enjoying enjoyable things and enjoying life.....?

I believe that we all exists forever. I beIieve that after we die our sole leaves our body and we experience something else and keep experiencing different experiences like lifetimes forever. This idea has really caused me to have a hard time enjoying things and make me happy. The reason is is because everything I experience, I know it will end and that we are all eventually going to have to face a challenging or painfull moment evenatually. Being that we exist infinitely I believe that means we will eventually experience every possible expereince you can think of to an infinnite amount of times, that means that I will probably expereince the worstest possible expereince I can imagine at an infinite amount of times. This scares that crap out of me because I'm scared knowing I'm going to have to experience that. I am now having a hard time enjoying fun things like, eating good food, , relaxing, and music because I know the pleasureable experience will eventually end and that a bad moment is going to happen. I hate this feeling. I wish I never knew this, I struggle so hard to not let this bother me. How do I not let this bother me?