I think about this from the perspective of a parent, and my youngest runs a little higher on the anxious/needy dimension than his siblings. What I try to do for him as a parent-- and I'm not perfect by any means-- in this kind of situation is two things:

1)validate his need to talk, emphasize that talking is great, it helps your problems, and I'm really glad he's willing to share this with me. If I don't have time in the moment he's needing it, I tell him when I will have time-- after work, after school, 4pm that afternoon, whatever. And then I keep my word about it.

This way, he learns that it is okay to need, but it is also tolerable to wait until the other person has time for your needs. It also reduces his anxiety, because he realizes that he can count on himself in the meantime.

2) respect for the other person's "no" (or, more accurately, "not now."). I think that this is intrinsically linked to #1, because it's hard for kids to respect "no" if they are not responded to with empathy and validation. Perhaps your parents had other troubles with setting limits with you, other than putting their hands on you. But with my kid, he doesn't try to block the door or sit on my car in a power struggle to get his needs met, because he knows they will be met later. He has respect for my needs to get to work or whatever, because I respect his needs.

In other words, your parents should have been able to work with you so you never had to put yourself in those dangerous positions just to try to get your needs met. It seems to me that you had very little else, if anything, to do or say to demonstrate what you needed at the time. So you chose the only thing you could. I feel sad for the spunky little girl who was so desperate to simply talk with her parent than she would go to such lengths to try to get it. It really wouldn't have been that hard for your parents to help you tolerate waiting to talk to them, and to teach you that even if they couldn't meet your needs at that moment, they would at the first opportunity.

I think one of the tasks for you, as you heal from this abusive dynamic, is to stay away from re-creating this in your relationships with other people. I wonder if your thing with your former T when you emailed her despite her instructions not to, was replaying this kid-on-the-hood-of-the-car moment. Perhaps it is part of your work to learn to tolerate waiting to get what you need, and to respect that other people have needs as well-- this doesn't make your need wrong-- but that relationships require meeting others' needs (even a therapist's) as well as getting your own met.