My basic thought about self-healing would be something like this.

1. Figure out what you do, what behaviors, that can be traced back to childhood neglect. For example, maybe you don't say what you think, because whenever you did/do, you would be/are verbally abused. Make a list.

2. Pick out one or two items on the list to focus on. let's call it X.

3. Notice, without judging yourself, each time you do X. Simply notice. "Oh, there is X again." "Wow, look, X is over here too."

4. Over time, as you notice, your mind can start to find other ways to do things, healthier ways than X. This can happen without you necessarily being aware of it. One day you might suddenly realize, "Wow! That time I didn't do X!"

When you can see a T, I definitely recommend that. But the above could be a positive step in the absence of a T.