I'm thirteen years old and for the past two years i'v been learning quantum mechanics and relativity. i'm aware that one of the most important tasks of physics today is to unify the four fundamental forces. that is to put quantum mechanics and general relativity together. i'm always a huge thinker and i have some ideas but before i can put everything together (which might take years, i know) i need to actually know why can't these two theories put together in a mathematical way. Just so you know we don't know much about mathematics like calculus or whatever at this age so be very descriptive. I hope you can help! Also, i know there's super string theory or m-theory but the whole ideas of parallel universe and 11 dimensions kind of seem to fictional. I know Einstein wouldn't have liked it if he was alive. plus there's no proof (or at least important and considerable proof)of anything that string theory states. I know the theoretical framework of quantum mechanics and general relativity but not the mathematical. So again i hope you can help!