I envy you a little bit.
I've noticed that my overall impression of experiences is usually extremely negative, as no matter how many positive memories I have, the negative experiences always overwhelm me so much that the positive ones don't even feel real.
I remember going to a vacation, and while there were a few pleasant moments, I can't really recall them and re-experience them - I just know rationally that they did happen. But recalling unpleasant moments brings all the unpleasantness back to the present moment.
I really wish it was the other way around.
I started noticing thoughts that were so negative/depressive that I was actually aware of how irrational it was. For example things are actually quite good but my mind is in the dumps. So called Automatic Negative Thoughts (ants).
Since then been trying to reprogram my brain. Force those thoughts out of my head. Start singing randomly. It’s hard and I’m not always successful but I’ve definitely noticed a big improvement overall.
Hopefully this helps you too!