Let me tell you this. I came here around 6 months ago looking for advice as well.
I had a 4.0, hadn't taken the GRE, and was also starting to observe (August 2014). I observed for 42 hrs inpatient, 20 hrs sport peds outpatient ortho in the same month that I applied and also took the GRE and got a 302 and 4.0AW. I still lacked confidence in my application, but guess what.. I got accepted to all of the schools that I applied. LORs and essays also count of course, but I didn't realize how that GPA can really help you out!! Two schools that I applied had an average of 154 in both verbal and quantitative and 4.5AW, I got a 145 verbal, 157 quantitative and a 4.0AW with 4 days of studying. I was bummed I didn't meet their requirements, but now I laugh at how nervous I was. You're not starting late, I got accepted to 3 schools in the next 5 months afterwards and graduated last December. Being that you have a 4.0, you may earn a high GRE score as well...so don't worry. I read a GRE book from Princeton Review I believe in those 4 days before I took it. Foolish and risky of myself, but I was working 30 hrs/wk, and observing 20 hrs in those two settings so it was hard.
You will persevere!