All teenagers hate their parents. It's a law of nature. I had horrendous issues w/my parents growing up. Ran away. Got caught and came home to find they were sending my to a psych ward for a month. I was desperate for a horse for years but instead of suggesting ways I might find to be around horses (volunteering) or earn money to buy a hore, they blew it off as not important. I could go on and on... but why?
I am now a mother of two and although I parent very differently from the way that my parents did, I can see what financial and emotional struggles they were up against and I know that every day they got up to face a tough world and did the best the could, and I respect them immensely for it.
Times are hard right now. Many people are selling their beloved animals b/c they cannot afford to feed them. My best friend's husband was fired after being falsely accused of something, and they don't know if they'll be able to make their house payments. Another friend's new baby died a few days after birth last week. I am not saying that you should not be upset, but I hope that you can find the capacity to see yourself inside a larger view of a world full of pain and joy and wonder. You have an imperfect family... but you have a family. They are alive, and there is love. Try not to dwell on your anger, but focus on positive action to improve the areas of your life that make you unhappy. If horses make you happy, figure out ways to get a horse yourself or work with horses, even as a volunteer.
PS I've still have never had my horse. Maybe someday....