I agree with the others, you have a right to be upset for them invalidating your feelings. My father's the same way and would say things like what your step-father said "I know how to handle things" etc.

It may have to be something you have to seek on your own. I hope there is a therapy treatment plan that will work with you. I found Open Path Collective which works with what you're able to pay. And they do it through video conferencing, so it's easier on those that aren't able to drive or have conditions that prevent them from leaving the comfort of their home. I hope that helps.