Hi MajorConfusion, I just wanted to say that I completely understand where you're coming from with this:
I don't see therapy with a stranger as a good thing. I see a person across the desk at a paid job that wants nothing more than to see Friday come and get out of there.
I used to see therapy as this as well. I went through a string of incredibly unqualified therapists when I was young and was precocious enough to manipulate them into what I wanted to talk about. Into my adulthood I had a disdain for therapy that was really only fixed once I found myself in intensive outpatient for an eating disorder that had taken over my life. I remember my therapist saying to me:
If all we were doing was doing our job, would we challenge you? Would we press you when things got hard, or would we just let you talk about whatever you wanted, or sleep, or use symptoms instead of intervening because that is easier? I could just sit here and collect a paycheck, but remember, I became a therapist because I want to help people get better.
I think that last part, especially is huge. This person chose their profession because they wanted to help me get better. I know finding a therapist is hard and scary, especially because you're opening up to, as you said, effectively a stranger about horrible and vulnerable things. I strongly support therapy because of the difference I have seen in my life, both before and after ED recovery (I still go, and I may always go, and I'm okay with that). My suggestions are, find someone with hour long sessions - you're right 30 minutes isn't enough. Find someone you click with, if you don't like the person you will find yourself dreading talking to them. And finally, find someone who pushes you into leaning into the things that make you uncomfortable, because that's how things get better, and it proves that they are here to do the work with you, not just take your money.
If you aren't comfortable with individual therapy, I'd suggest considering group therapy so you have lots of help in getting what you need. What has helped me the most with my BPD SO is a group self-esteem for an hour a week (in addition to my individual, they work excellent together) because, I made friends with people also in rough places and felt far less isolated (which I can imagine might be true for you with you dedicating so much time to your father) and I felt like I had far more support than just my individual therapist.
A therapist won't have your particular answers, but they are a great resource for helping you find your own. You've gotta put your own gas mask on before helping anyone else put on theirs.