Observational bias : You remember only the bad ones, especially as they are the ones most likely to wake you, and thus cross the memory barrier to the conscious. You likely have good ones as well that you don’t remember.

If it really bothers you consider keeping a dream journal for a few months which should make you able to remember more, and more of your dreams. If it turns out you really have no good dreams, the next step is to learn lucid dreaming and fix that shit. If that’s too much work, you can try repeating “I will have good dreams” in your head as you go to sleep, you might be lucky.