im pretty sure that all the schools you are interested in require you to take at least 60 credits/2 years at their school if you want a diploma from them.. so the question is if it is worth it to lose a lot of credits..
i think that you should try to at least get involved in some things now, as soon as possible, so that you can at least list them on your application, i know that they usually only want you to do things that you care about, but im fairly sure that some EC's are better than none.. and also, try to see what EC's would support your application the best
also haha, i thought it was funny in the last line of your first post,
'Is there any advices? or just give me a blow. I appreciate any ideas!!'
haha, 'or just give me a blow'

awesome
good luck! and i definitely think you should aim higher than those schools you already applied to