<human>: Can you give me a shortened version of the text?

I'm seeking advice. My current situation is this: I am a 13 year old in 8th grade halfway through my school year, then I go into high school. Already now, I'm thinking about colleges, and I shouldn't like to stay here in the US.. However, going out of state (hell, /literally/ out of state) according to my dad would be totally unacceptable, but according to my mom, it's completely fine. As for going /literally/ out of state, I'm not sure of my mom's opinion there. My mother is the one housing me, paying our bills, working as hard as she can every day to provide. With that said, we live paycheck to paycheck, and I worry that in the future going to a good school may be out of the picture. I have this dream of going to study in the United Kingdom (while simultaneously training for the Olympics), either at Cambridge or Oxford. As you all know, the tuition rates to get into basically any good college in the US are absolutely through the roof, and that leads me basically to my thought. Now I know, for a 13 year old, that's quite the imagination; yet I still dream. As of now, my grades in school aren't the best (hovering around 70-somethings), and I seek to start improving with my science class (school policy= must pass science, math, and language arts to move onto high school), and on top of all this anxiety, that is yet another question boring into my head.
<bot>: I'm anxious that I won't be able to go where I prefer for school (Oxford or Cambridge, because it's insanely expensive in the US), and I don't know whether or not middle school grades affect college acceptance.