One very powerful and effective way to work with this tendency to push away pain and hold on to pleasure is the practice of tonglen.  In tonglen practice, when we see or feel suffering, we  breathe in with the notion of completely feeling it, accepting it, and owning it.

The mind is very wild. The human experience is full of unpredictability and paradox, joys and sorrows, successes and failures. We can't escape any of these experiences in the vast terrain of our existence. It is part of what makes life grand-and it is also why our minds take us on such a crazy ride. If we can train ourselves through meditation to be more open and more accepting toward the wild arc of our experience, if we can lean into the difficulties of life and the ride of our minds, we can become more settled and relaxed amid whatever life brings us.

As our kindness for ourselves grows, so does our kindness for other people.

When you open yourself to the continually changing, impermanent, dynamic nature of your own being and of reality, you increase your capacity to love and care about other people and your capacity to not be afraid. You're able to keep your eyes open, your heart open, and your mind open. And you notice when you get caught up in prejudice, bias, and aggression. You develop an enthusiasm for no longer watering those negative seeds, from now until the day you die. And, you begin to think of your life as offering endless opportunities to start to do things differently.

Suffering begins to dissolve when we can question the belief or the hope that there's anywhere to hide.

Somehow, in the process of trying to deny that things are always changing, we lose our sense of the sacredness of life. We tend to forget that we are part of the natural scheme of things.

Come back to square one, just the minimum bare bones. Relaxing with the present moment, relaxing with hopelessness, relaxing with death, not resisting the fact that things end, that things pass, that things have no lasting substance, that everything is changing all the time-that is the basic message.