Most undergrads have a careers/writing center that can be really helpful. Most that I've seen will continue to work with any alum. It's a great starting resource. Also did you do an MCAT prep? TPR did a whole session (3 hours) just on app processes and going over stuff about the personal statement. Also, as an officer of AED (our premed honors society) we have officers and other students go over essays. This was the advice I was given/give when asked.
Have a family member read/edit it - they will be able to tell you how honest you are being with your content
Have a friend read /edit it - they will have input based on knowing as a friend, and bring a different angle
Have a stranger (friend of friend) - they will be the most honest and won't be afraid to rip it apart
Have a professional (career center, etc) - they will have the best technical advice
Also, feel free to PM me if you want someone to bounce things against or someone to read it over.