You seem pretty solid for leadership, teaching, and community service. The shadowing, which is considered a passive observership, is great. Are you planning on a research experience? It's not clear if you are a TA or researcher in the biomechanics lab, if the former, look for a lab for this summer or next fall that you can continue with for the next 1-2 years. Also, how will you be acquiring your clinical experience (active involvement with sick people)? It's time to get that started.
Your projected cGPA is right at the median of acceptees to US allopathic med schools. So, theoretically, you'd be fine with an MCAT socre of 31+, but higher gets you more choices. The Rhode Island in-state school, Brown, is fairly selective, with median stats for those accepted of 3.8/35. More than half of its class is filled with its BS/MD students, so you can't depend on an acceptance there.