(((martina)))
I have a very hard time admitting this tendency of mine. It's so much easier to lay blame on everyone else!
Kudos to you for recognizing that you bring a lot of injury on to yourself

~ through inactivity and giving up trying. I honestly believe that your ability to see this in yourself, and admit it, shows that you've come to see yourself in a different light. Which is emotional growth!
I've been in DBT myself. It was over one year ~ I went through the cycle twice. My second time going through is when I was able to put more thought and insight in daily life, and apply the various techniques recommended to help me make it through tough times. It takes time to adapt. Some people picked DBT techniques up quickly (they're in the minority) but most of us had to go twice before we started feeling better. And then there was another minority of people who weren't ready to make the committment in their lives.
It is a committment. It does take time to fully grasp the core skills discussed & apply those skills to your daily life. Even those who've been actively praticing DBT for many years don't always make the best decisions. The difference is being willing to admit that one didn't make a wise decision because they simply didn't want to (felt too emotional, lazy, whatever..). The point is that they are then willing to deal with the consequences of their inappropriate behavior (or words).

You'll catch on. Give yourself a break ~ Giving yourself a break is one of the biggest skills one can learn through DBT. Time and active practice ~ You'll get there!