Therapists will always be hit and miss in terms of who you actually get on with, you will need to make sure they’re properly qualified and licenced to practice however because there’s plenty of people out there that are willing to take your money and act like it. I’m sorry you’ve not had the best experiences with them, I can imagine how frustrating that is to be in a situation like that.
In terms of the past experiences, sure, they’re important you make peace with them, but no one is able to just switch it off and move on, we like to believe we have control in our lives and situations like that tend to do the opposite, so the first step would be to aim at creating more control over the present, doing that would help you with dealing with the past.
I can offer some advice on how to implement that into your life if you’d like, but it’s entirely up to you. Just drop me a private message if you don’t want to talk publicly.