I totally agree: academics should be your priority.
As for ECs, my view is that you need to enjoy/love what you are doing. Honestly, it does seems like you’re trying to do a lot, and you need to answer to yourself whether you enjoy all these activities or whether you’re just simply going through the motions to pad your resume/ECs.
I am not saying you are, but you need to be the judge of that.
Colleges can see through quantity over quality.
Most of all, you need to enjoy being a teenager. Work hard, but have fun going it. Time is a very precious commodity.