Does the Volunteering/Shadowing that I perform over the summer between HS-College count for my college hours?
The answer is maybe.
The issue is that you only have a limited number of slots (IIRC it’s either 12 or 15) to lists all your community service, clinical volunteering, shadowing, jobs, leadership positions, awards/scholarships, research, publications, hobbies, and other achievements on AMCAS. So, sure you can list your pre-college volunteering if you don’t have more recent or more important/meaningful activities filling up all your slots. But that decision is left up to you. There aren’t any hard & fast rules about it.
Remember that it’s not raw number of hours that’s important, it’s the quality of the experiences and what you’ve learned from them. Med school adcomms will expect to see recent clinical volunteering and shadowing on you application, not just activities from 3-4-5 years ago. This is because you will change and mature during college and the perspective & insights you get from your volunteer experience will change also.
P.S. Make sure than you know the name & contact info (phone, email) for your supervisor for any ECs you do decide to do since AMCAS requires that info when you apply. Med schools do spot checks to verify your EC involvement.