How much weaker is my application if I don't have great ECs?

I will be applying next year. How am I looking for the most competitive schools (one of the schools I'm really interested is top 10 and I feel if I'm a good applicant for the best schools I'm prepared for any school). I looked at the AAMC Adcom survey, and..

I have 0 hours of clinical volunteering. I'm starting next year.. is there a realistic way to make this up or am I fine with only 1 year of work?

I have about 40 hours of shadowing. I started at the beginning of this year. I will...

How much weaker is my application if I don't have great ECs?