OP, you keep saying you’ve been used by people. That’s a red flag for me. If you lease a green horse and put hours and mileage on it, and the owners then raise the lease price or decide to ride it themselves, that’s not using you. That is exactly the transaction you agreed to, with the owner taking the risk that you won’t screw up their greenies.
If you are a barn rat working and trying to scrounge lessons/riding time, that’s not being used either, unless you don’t ever get to ride.
I’m not even clear on why you felt used by the therapeutic riding center. Volunteer work is umm, volunteer and work.
Riding a difficult pony for a kid who just wanted to show might have screwed up your riding, but those folks weren’t using you either. You wanted riding time, they had a pony that needed to be ridden.
What strikes me about all your posts is that you’ve had a lot of the chances that kids search for when they have limited funds. I don’t know how well you’ve learned to ride from them, but I know you’ve learned to think of every person who gave you an opportunity as a “user” if they got anything out of the good they did you.
I think you have a terrible attitude and I’m glad you won’t be taking your frustration out on a nice horse. You have a comeback for every helpful thing people have said on here, so just take your excuses into a different sandbox.
And since I’ve already said more than normal for me, I’ll say this too: get a job. Any job. It will teach you a lot more than sitting at home and letting Daddy pay your bills while you feel sorry for yourself because you can’t afford a made horse. There are a whole bunch of crappy jobs out there that will give you a little income and self-respect while you wait for the good opportunity to open up.