WOO I'm a runner too! Okay you are INSANELY smart! You shouldn't have any worries.
Besides, those B's would be pulled up by the extra point provided by AP classes (if your school does that), Most kids struggle with few AP classes, but YOU have SIX and you're ACING them. The colleges you apply for will see this and will be thinking WOW. On top of that, you're not backing down in senior year.
Plus, you have extra curricular activities. All you need to do is take some practice SAT's and study over the summer (if that's the only time you have) and crush it in the fall. I can't believe you're even worrying.
In conclusion, those B's won't even touch your chances of getting into an Ivy league.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.